Bitcoin developed a bubble in late 2017 but i think to say that bitcoin has been in a bigger longer term bubble is just dismissing emerging technology. There was such a parabolic rise at the end of 2017 based on nothing really which was concerning. This was taken advantage of and that why regulators around the world are stepping in to make sure that ill-informed people are not ruined by others in the future.
If you ignore the ridiculous bump from November then bitcoin is still doing quite well. I havent read anything seriously bad in a while but have seen some positive notes on adoption and acceptance.
I look forward to 2020.