1. it's a limited resource
2. it lets people do things no other financial vehicles can
3. highly influential people behind crypto haven't had their fun yet
So - no, I don't think this is a bubble.
2. see 1
3. not sure what you mean by this
No matter what happens, a win for any crypto alt is a win for Bitcoin.
major US banks and whatnot have started to make crypto/bitcoin plays in the past few years. The idea is that these plays are early for them, and their followthrough of these ideas will be good for bitcoin.
Of course they could also die the death most moonshots do.