Long term you want more coins focused on solving a legitimate real world problem rather than a coin that is merely trying to piggyback on bitcoin and altcoin trend.
That's also what Vitalik said and I think there are right now too many coins that don't really do anything.
With that being said, if you look into privacy coins like pivx monero cloak, xvg, etc, those will be good in future.
Also coins that are protocol based like Ethereum and Neo will be good too. Stratis is way down right now probably it will recover soon