Etherium to 1,000 at a minimum. Once these ICO are up and running it's will move up. It also has the network effect in its corner. Not saying there won't be another protocol that will emerge, but it will be tough.
I am holding on to my alt coins as I bought them with a specific belief. Some are up and some are down. I will hold the BTC that I own and add according to my plan. Stay to coure and remember why you bought your alts in the first place. If something fundamentally chages then I would sell.