Most people that investing bitcoin now, are just investing to make money. It annoys the hell out of me. 90% of people haven't read the white paper! Don't even know why decentralisation is a good thing! Don't know why the blockchain is such a revolutionary invention! It annoys me so much! These people just invest because they want to "get rich quick".
I understand your rant, I don't think you should worry.
Mos the people that used the internet in the late 1990s did so for email and hanging out in shitty chat rooms on AOL. Most people didn't appreciate what the internet meant in terms of shared information, how it mad information and knowledge more accessible and free, how it would change the world.
Did that stop the internet? No.
Will current speculators stop bitcoin or crypto currency? No.
It's OK that people get involved for narrow or shallow or selfish reasons. We still all gain when someone new decides to buy some bitcoin. The network gets stronger.