I am wondering if Bitcoin gradually ceases to be relevant
You'll stop wondering when Etherium bubble pops.
If the Ethereum price stays about 0.02 for the next 6 months, will people still think it is a bubble?
Let's wait 6 month then. I bought a few ETH just in case :-P But I also believe the bubble will pops soon or later.
I think now is a bad time to buy now. No altcoin has ever seen a rise like bitcoin.
Most (look at DASH) go up in a pump and then go back to their normal level.