Is New Interest In Bitcoin Driving Up Price Or New Interest In Altcoins?

I really can't help but wonder, especially as we see more and more market cap go to other cryptos, is it interest in cryptos/alts in general that is driving up price, or is it interest in bitcoin?

The way I see it, BTC is like the USD of crypto. Everyone trades in BTC. When we check our balance tab, we check to see how much USD/BTC worth we have. Lately, I have seen Ethereum getting a decent amount of mainstream news and personally I believe that is a big chunk of this new interest pouring in. Not only that, I also believe the "bitcoin fans" are also getting more and more into the Alts as time goes on. With this being such a risky, unregulated space, I believe many investor type people shied away from altcoins while remaining weary of BTC in the first place. As time goes by, and you see/watch markets go 10/20/30x in a years time, it starts to really spark interest.

I am wondering what people think? I see many people claiming its time for the Bubble to burst, and although I agree that time is coming, inevitably, I honestly thought it was going to be far before 2950... Time and time again, we see that BTC is a beast of it's own and tradition trends and logic/math doesn't quite have the same effect on this wild animal. Are altcoins even a safe way to store value in the event BTC drops? After all, if the BTC is dropping, why should this Alt hold value against it?