No one knows but Capitalization of Bitcoin at the moment is extremely high.
Everyone knows that bitcoin has the highest market cap in the cryptoverse.
Bitcoin has undergone 10 crashes in 15 months and price is still $ 9200 as of now and getting more stable with increasing merchant adoption and technology development.
Can't count all of those crashes but bitcoin isn't $9,200. As of today it's $7,400 and I guess it's starting to have a small dump already.
A bubble can inflate even more, but in any case, rather, it will collapse in price than it will grow.
It will only collapse if everyone will sell during the high and there's no need to worry about it, we've seen it before not only this December-January (2017-2018).
What could be the reason for this sudden crypto market pumping?
Everyone's speculation is BlackRock.