Will be worth a lot. I was thinking that even the ones labeled "scam coins" or ones that died off will be worth a very lot in the far or not so far future.
So my point is to hold everything if you're thinking of dumping.. what I'm saying probably applies more to miners.
Most of the altcoins are not scam, most of them are really promising project. So I can say that many altcoins have really potential and I believe that many altcoins have a bright future.