As a relative analysis, BTC's growth to complete SEGWIT has launched it upwards towards 3k, which i believe is the result of 3 things.
1) BTC is attracting the market to liquidate their Altcoins and get into BTC to participate in the growth.
2) BTC Appreciation has subsequently caused general disequilibrium due to its fiat appreciation
3) both
BTC is over valued at the moment, while LTC XMR and ETH are undervalued. If these coins do not follow suit, BTC will revert to the mean violently.