In my opinion, only the ICOs that were serious in achieving their goals will remain. You can determine one project is good if they can be able to provide a working product since it gives more confidence to investors that they know what they're doing. I've been keeping an eye out on NeuronChain for now. They're one of the projects out there who developed their product first instead of making promises with a whitepaper.
ICO is a platform where you can introduce the product for open market, yes, it is very Risky to sustain and remain in the market once it is Launch, it is the consumer's behavior is one of the most important indicator if you product is acceptable to the market. Good Marketing strategy is very much needed for good project for ICO, with out the support system such projects fails to gain momentum in the market. ICO will continue to be the Launch pad for any project in the future Market.