You are absolutely right, during this long bearish season many many good projects died forever and some leave during the initial coin offer. The crypto market is unpredictable so far.
The bearish market will make altcoin scam and useless dead. But for good altcoins, I think it will still exist and grow, although the price can be dumped many times. I believe that in the future when the bull market starts, good and quality altcoins will surpass and grow like 2017.