More than that, I can't say. A lot can happen technologically in five years.
I'd not buy any now for five-year layaway, but that's mostly due to issues of variance comparing poorly to the size of a minimal useful bet. I've got my stash of old money; that's enough for me right now.
But why would it stop at $2/coin? Seems to me that anything so catastrophic would probably just take it down to $0, make it worthless entirely. But maybe I am approaching this wrong.
SHA and PKI would have to be broken IMO.. and if that happens we have WAY bigger problems on our hands than some emunie.
I say yes it will be around... maybe based on a new currency.. like a global rate tied to some other metric that is not fiat.