The time has been given to the altcoins to set things in order, get use case, good exchanges, technology development and liquidity. If after this bear market some coins dont get most of these they are likely to be delisted of most on the big exchanges which could lead to their death. De-listing will be a type of death issue certificate as time passes and this signal should determine your holdings. If your coin had not been listed at any time maybe because of the market, the team competence can be assuring factor for holding or think otherwise.
Well the thing is, there's way too many altcoins nowadays to hold a decent price. This is because the number of alts exploded throughout the last year and 2017. Now only the top tier coins can coexist with bitcoin and that is how it is going to be. That is why we see this massive shift from alts into bitcoin and the bitcoin dominance soaring. The only way the alts can go up in price again is if a lot of fresh newbie money comes in.
It's no surprise for people to shift for bitcoins right now since there's an event where bitcoins highlighted in the first place and provably after the event which can subside the hype people will go back to their supported coins and by that we can see a healthier alt market. Newbies maybe directed for some other alt's but for sure it's temporarily since they will get out if they freak out once their expectation didn't met.