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.
I think even in the future, those "scam coins" will still be of no value. We all know that the users determine the price of an digital currency, if no one is using it, that means, there will be no value of that currency. So even if you wait for a hundred years, there will be still no value for it because you are the only one using it.