So basically you are saying that BTC no longer has this function of "refuge", the safe-haven cryptocurrency. The fact bitcoin behaves like altcoins (or vice versa) means what?
In the old days people were going from Bitcoin to altcoins because altcoins were offering quick gains. When they were selling they were coming back to Bitcoin. Now people are investing in alts straight with fiat, or going through tether instead of Bitcoin. It doesn't have to be that safe refuge because it's much easier to buy and sell altcoins. It's good for Bitcoin because the more stable it is the better. I'd rather have people buy Bitcoin to own Bitcoin not to do it because they want to invest in altcoins.