I wonder if you still think same, Bitcoin is not in a bubble?
I think they are already in a bubble, both Bitcoin and Ethereum, and other alts too obviously.
Hard to say what's a bubble and what's not these days, but Bitcoin has skyrocketed in the past couple of months and I don't think is sustainable, it will probably burst soon.
The question is not if BITCOIN is in a bubble. Etherium is it's own animal. Here's proof:
Pull up two charts: a 6 month chart of ETH and a 6 month of BTC. At gross level, both are on an up-trend. But beyond that, the similarity ends. The massive rise (and more recently... fall) of BTC price has not been matched by price changes in ETH. Indeed, the biggest change in Ether was the abrupt doubling around Dec 11.