It's been proven over the last few years (think this time two years ago) whenever Bitcoin rises, it usually drags up the price of the other alt/cryptos as well. And, when the price falls so too do the alts.
Some coins are fashionable for a while (especially after ICO launch) but the true test is their application in the wider community.
indeed the movement of bitcoin will be followed by other altcoins, although not all altcoins, only altcoins can survive. while altcoin which is not able to develop will become junk coins. of course trust and community become the main capital of altcoin to develop, besides that products that help the community can make altcoin will still exist