Yea diversity is good and yea people can have different options to mine but when you have over 100,000 altcoins how in the hell can exchanges keep up with this, what is going to happen is all things are going to be worth one penny because there will be so many different versions that nobody is going to know what the hell to mine. The exchanges will be pestered to add their altcoin until they just shut em down. It isn't about innovation it is about copying the source code adding your own tweaks to it releasing it after pumping it on 0 difficulty then dumping an absurd amount on an exchange and letting the people who you got interested in your coin wait and wait and wait with the hopes of it ever going above 5 cents a coin.
Again, like mining, no one is forcing the exchanges to take up the coin except the exchanges themselves. They look at it one way and that is from a profit standpoint. They see profit, they will add and let it be as it will , if it is to die so be it, but they are going to get their cut too if they think it is worth the time.
Also, its up to the miner to actually educate themselves. I used to be a noob once too and chased every new coin released. A lot had to do with the fact I was running just nvidia... but still I chased.
Now in all my time, I am much more picky on any new coin released. I learned what to look for. Sure, I may get burned, but really it happens much much less to me now than it did then. Yea... still want to dump the thousands of porncoins I am sitting on lol.