Currently the market is so saturated with altcoins, that people don't care about decentralization, and they probably never have in the first place, but only about what ICO project is the next one to invest in.
From a community focused on decentralization we have gone to a community focused on gains. It doesn't matter how trashy a certain project is, all people care about are how hard something can pump. Sad reality.
Perhaps, but it's also a reality we should have expected. The design of Bitcoin and most other cryptocurrencies incorporates scarcity. You can't have a scarce commodity undergoing exponential growth in usage without the price being driven to the moon. In that context, with so much money pouring into the markets, it's only reasonable to expect a lot of greed. That's just human nature right there.
It's not necessarily a bad thing. Greed is a strong motivator for adoption.
I was drawn in by greed myself in 2013, and I was chasing altcoins back then because "Bitcoin was too expensive." I think a lot of people who came to get rich end up getting fleeced after the bubble pops and eventually leave. The ones that stick around do so because of an appreciation for the technology and design.