I think back to 2013. I believe that entire year (Jan - Dec) is actually best looked upon as one large run-up with a bear trap in the middle, rather than 2 distinct bubbles. During the bear trap in the middle was when people from the first half of 2013 were starting to "buy more on margin" in the form of opening credit cards, taking out loans, even remortgaging their houses (yes, it actually happened more than you would believe). By the end of 2013 iirc the mainstream media was covering Bitcoin far more than it is right now. Today there are regular articles in the business / tech sections, but in Nov / Dec 2013 there were headlines on the mainstream daily news slots on TV, there was a weekly televised news report on a top outlet where a reporter told daily stories about living on Bitcoin... it was nuts. I can't see that we've reached that level of real mainstream attention yet. Bitcoin is not yet headlining the regular news.
Incidentally just before this mainstream euphoria started happening the market underwent a huge crash of roughly 50%, from which it took less than a week to recover.
This bubble is purely driven by emotion. it is baked by nothing else then chinese miners and electricity.
Other Coins will replace Bitcoin but it will always be a good pump n dump.