As I ran out of space in the original post, the only closing comment is as follows:
The dollar volumes in BTCUSD are falling and more money is entering altcoins. If you are a trader, you should be following the money. If the correlations remain highly positive, there is no reason to be trading BTCUSD, as betas on alts far outperform BTCUSD.
For reference: Beta is a measure of the %-change on a 1% change in the benchmark. In this study, BTCUSD was the benchmark. So if the beta is consistently above 1 and correlations are near one, trading alts is like trading BTCUSD with higher leverage.