What I have noticed, blockchain solutions are progressing more and more into specific industries that used to work without it few years ago. And to be honest, I am pretty impressed with the value that certain worthwhile blockchain solutions are bringing to the table. Even though, many parameters must be analyzed before blindly believing in the benefits
There's no connection to blockchain and why altcoins are being fragile to bitcoin just like what op is asking. But what you have said is a fact, the progress of blockchain to the world has been so good and is becoming more popular and known what it can offer to most companies.
I'm also thinking about this, it's just that I'm pretty sure that many people believe in bitcoin that development continues, and bitcoin is a decentralized coin, and no one has power over it. besides that, bitcoin also has multifunctionality.
whereas for altcoin, most altcoins are controlled by a team, and if the team is not trusted, then altcoin will be damaged, this makes altcoin more fragile than bitcoin.
This is one of the true reasons why alts are like that, some of them are being controlled and manipulated.