Note: these are just my opinions.

Adoption is something of a mantra that every crypto enthusiast keeps on uttering; the dream that somehow the general public would suddenly buy up cryptocurrencies en masse and prices will go sky high, etc etc.

But let's consider in a realistic manner, what would happen, should governments the world over decide to adopt blockchains and cryptocurrencies.

Government Issued Stablecoins

Governments are increasingly looking to develop their own digital sovereign stablecoin, and that might be the first contact that the general public ever has with digital currencies. Ironically these government-issued stablecoins will reflect the same ethos as their current fiscal policy, and also be very much tightly controlled. Not exactly the decentralized future we hope for, but governments want control, and this will be what the masses will get.

Don't believe me? Google China's DC/EP.

Interoperability Blockchain

What kind of blockchain will those government stablecoins run on? Will they adopt an existing one or build a new one? Will all these stablecoins run on one blockchain? Given the "unity" of governments (note my sarcasm), I doubt there will be a single blockchain.

Therefore we would be looking at a fast blockchain that supports interoperability, and allow those stablecoins to flow in/out of it.

Will there be one dominant blockchain? Looking at the current space, we have Ethereum as the undisputed leader in terms of usecase, with lots of smaller blockchains coming up promising lots of better features. Which will come out on top? That would depend on ease of adoption, speed, features,etc.

Most likely we would see a few dominant blockchains that are favored by different areas of the world.

Financial Services

The general public will need easy to use swap services built on top of that blockchain. Not everyone would use exchanges. Its almost 100% certainty that these would be heavily regulated.

Speaking of exchanges, the wall streets of the world might come onto trading 'on-chain', meaning they might want to shift their billion-dollar trading systems onto a blockchain, and trade all kinds of instruments. Bots will dominate, just as they do in the trading markets now. So intelligent trading systems would be in demand. Whether they would be open up to the public, is another question.

Current lending services like Celsius might integrate sovereign stablecoins into their system, allowing the public to save their money and earn interest. Interest rates will fall, because if centrally controlled stablecoins dominate the space, then economic conditions in the crypto space will just reflect the current economic mess.

Privacy

Privacy coins will almost certainly fall into an illegal usecase classification. Governments love control, remember?

There will be holdouts, for sure. the current crop of privacy coins and their proponents will not give up and die off so easily. But it will gradually get harder and harder for them to transact their coins. 

Sectors of industry

Supply Chains, IoT, Messaging, Social Media, might benefit from blockchain. But will there be one dominant, regulated ( again, remember government control ), cryptocurrency for each of these sectors, or a few strong survivors? My bet is on the latter.

Investments

Digital securities or security tokens will come into play. They aren't merely digital shares. Some of them have use cases that make full use of what a blockchain can do. Take RealT for example. Owning a token gives you immutable fractionalized ownership rights over a piece of American real estate. That comes with daily dividend payments in the form of a stablecoin, straight into your wallet. In turn, defi primitives like Uniswap means that you can trade your tokens with other whitelisted investors, 24 hours a day, 7 days a week. That is definitely something a normal stock can't do.

For traditional investors, or people looking to make passive income in cryptocurrencies, security tokens might be the safest bet in this new(relatively speaking) world. The best part is that these security tokens are already regulated TODAY, unlike other cryptocurrencies.

In conclusion

I just don't see a scenario where governments don't attempt to regulate the blockchain industry and the cryptocurrencies that come with it.

There will be projects that come to prominence. But there will also be projects that will not survive due to either regulations choking them into closing, or just lack of usage.

If I may offer a piece of advice:
Look for projects that are either market leaders in their own sectors, or offer a compelling use-case that no one else has accomplished yet.

Thank you for reading, and stay safe in these troubling times.