For me i Believe the other way around, if bitcoin will continue to go a downhill trend so as other altcoind will follow in the long run. Yes intially i think the altcoin will rise in the fall of bitcoin because investors will seek another alternative investments but surely if the mother of all cryptocurrency will degrade i believe all the more the reason that other altcoins will follow the same lead.
Agree with you, I believe this market is build this much because of Bitcoin. so if bitcoin falls investors can think why they need to make them self at risk. why investors need to trust on altcoins if their lead was fallen.
The same people who are causing the market to come down in altcoins and the same making it come down in bitcoin and those are the whales which the traders obviously respond to those movements in a way.
If you notice, most times bitcoin is in consolidation, the altcoin market is always known to do well and anytime we get to see a huge rise or fall, then every other market responds. It is just like inflow and outflow of cash and that mentality has kicked in for a while now, with most traders opting out of altcoin, once bitcoin is in a downtrend until further notice.