If you have to own altcoins, that's probably the smartest tactic.  I'd say 99% of them are never ever going to get used for anything other than speculators trading them for bitcoin, back and forth.  Even in the top ten, most of them aren't getting used as currency.  Bitcoin itself barely gets used.

I recently bought some Dash, as I think it's one of the few that's going to survive and there's been some news that Venezuela is picking up on it as an alternative to its crappy, hyperinflated fiat currency.  But I don't plan to hold it forever, as I think bitcoin is going to outperform it and all the other altcoins.  I just think there's a little money to be made before I trade it back for bitcoin--and I wouldn't touch the other coins, even if they're in the top 10.