I think I can see both sides of this coin (so to speak).
Who wants crypto to succeed in the world at large?
1. The Developers
2. The Miners
3. The Altruists who who wants things for the good of the community.
4. The Revengist - those who just want to stick it to the government any way they can.
Who doesn't want it to succeed?
1. The government - it is nearly impossible for them to control (unless they threw a lot of resources at each and every currency and forcibly devalued them).
2. The bank - OMG! No more fees!
3. The people who are frightened that little Susie or Brad will buy illegal items with this new currency (which they could have done all along with cash anyway).
The bottom line is competition IS healthy is MOST environments. In this environment though we are seeing so many new currencies come out that they are diluting the entire pool of resources. At one point every town in the US had it's own currency and that idea failed MISERABLY. They were forced to create the federal reserve so that their money would have value in all foreseeable locations.
And natural selection IS a good thing, but only if a new currency actually has a valuable, marketable, and usable feature that would make it a good candidate for survival. A dozen different coins all with different attributes will just make Crypto-Currency as a whole less attractive for adoption into the global market. Who wants to have to sort through 10-20 different coins, just to pay with a currency that happens to have a feature that is valuable with THIS transaction?
Is any currency perfect? Nope. Since perfect means different things to different people. For right now, the end result is to get enough of one coin to trade it into BTC, so that it can be used (almost) universally.
The issue with all of the current new cryptocoins is that they seem to be coming out so fast, that they resemble a Get-Rich-Quick scheme...
1. Invent an item.
2. Find gullible investors to buy it from you.
3. Get rich.
4. Laugh while value drops.
5. Move on to next thing or buy back at low prices and resell again.
6. Repeat steps 1-5.
So in all fairness, everyone is right...
Except the trolls, of course