I disagree that Alts are down because people are trying to buy more BTC. Alts are down because of sentiment. I believe that Alts are in the same overall trend as BTC...up. That means, just like the recent bottom of $3,045 and the July bottom, BTC will move ahead of the Alts and then the Alts will follow.

I believe the Alts will bottom any moment and start printing green prices. I call this non-phasic relationship bettween BTC and Alts within the same trend.

Since one only needs to hold BTC 24 hours prior to fork event, people selling Alts to get BTC now might not be the cause.