Hi brother,
Once again a very well written post. I like how you at first introduced the website and then focus on the contest.
I'd love to participate and write a similar text but I'm simply too busy.

Because I am aware of centralized systems that are also coined as cryptocurrencies and I don't regard them as true cryptocurrencies.

I agree with you. Many coins claim they're amazing cryptos but in the end they aren't [(even) decentralized].

The rest of the article is really good too - issues regarding governments (and their power) and lastly the financial system with its bubbles and connections.
Anyway, I don't really think that simply "a lot of different coins" would change this whole economy. Market cycles and bubbles probably always will be there (this whole overlapping as well, I guess). It definitely is better to have various coins/currencies instead of only one of course.