Some bubbles will burst for sure, others will stay and become even bigger, and maybe they won't burst at all. Bitcoin is biggest bubble and wont burst if there is constant demand for it. This fact won't change anything, we could soon see 2k$ BTC we all know this.
Bitcoin is losing almost 1% per day of the total market cap, I still holding some but seriously considering switching more to alts before the flippening really gets crazy.
I think the alt bubble will pop as well when Bitcoin's does. Historically, that has always been the case.
And to clarify to the above posters... I do not think cryptocurrencies are in a long-term bubble. I think they are still undervalued as far as the longterm goes. However, as with anything that is traded on the free market, there will be massive swings, both positive and negative. I am referring to these swings (or "mini bubbles") when I say the cryptocurrency market is in a bubble. I am still longterm bullish, but this crazy upward trend cannot last forever. What goes up must come down. Mark my words, there will be a correction sooner or later.