What happened last time is that all the other alts rose with BTC because there was so much money flowing in AND alt traders felt the BTC market was overheated so they fled to good buys in alts. BUT, BTC kept going and going and the alts finally got cannibalized as alt HODLers got FOMO and had to jump back in until we hit $19k per BTC. That is another possible scenario as BTC climbs to close to either $35k or even $50k in the next wave.
I referenced you in my post on a similar subject: total market cap passing $750B and resteemed this post.