I don't think they need anything to survive this bear market all of them including bitcoin have crashed, most coins are below ico price now, if they will deliver a good product in the future they may rise again otherwise even exchanges delist them.
Actually at this stage, I would say a coin does not need any quality to survive much of the bear market as it will still cut across anyway. One might have said a product, but in the real sense, no project's product is being used in the real life for anything and the market is just simply speculative in nature at the moment. It is definite that with such speculative driven assets, the market will always move irrespective of the potential of the project in the long run, so I do not think any coin will need a particular quality to survive the bear market.
I think a coin should have a completely new and different idea. Like, it should aim to solve a particular problem faced by many people, or something like that. If the idea is strong, people will obviously never stop using it unless it is replaced by something better. As Bitcoin highly dominates the crypto market, I think aggressive promotion will also be needed so as to obtain a strong community.
Even with a completely new and different idea, nothing will stop a coin in this market from facing the bears when they come. There are so many coins with brilliant ideas and even rock solid products that are seriously undervalued at the moment as a result of the market conditions.
I do not think we will need a soothsayer to tell us that in such scenario, no matter the support of the community, the market is highly speculative and until we start seeing real life usage before we start considering certain qualities to help keep the market strong in value and have a sustainable one.