To start, you said companies but blockchains arent companies....companies are built upon particular blockchains.

Also, you are right there are going to be many coins that fail. There is a lot of junk out there. However, Wall Street, when it enters, it buys up everything that is not nailed down, even junk. In the end, a lot of it will get dumped and crash....so people need to be wise in what they hold.

However, there are many blockchains with a lot of activity on them (this one for instance). Holding solid tokens when Wall Street shows up is a very good plan. Those people start the euphoria...not us.