On the one hand, I would like to diversify due to volatility, but on the other hand, how many of these are actually going to survive? Eventually are we going to have 1 cryptocurrency that is fast, secure, anonymous, can handle smart contracts, and so on, and there will be no reason to use anything else?
I only invested in Bitcoins and in LTC (a while ago).
Bitcoin, is going to survive the reason it is the first decentralized currency and the first crypto-currency and all that its features.
It depends on you how many crypto-currencies you adopt because there is no limit on adopting.