Everything is a bubble. There are both macro and micro bubbles with different cycles. This bubble will collapse - the rate of capital influx is way too high to be sustained at this point in time. We will reach trillion dollar and stable market caps - not this year.
Check out my old post on riding the Bitcoin bubbles for some interesting sentiment:
Bitcoin is at a new high. It will retrace somewhere. Just like it has done time and time again in the past; each explosion reaching yet another all-time high. How high will it get? That is something I don't regard a topic worth debating deeply today. The next "all time high" will probably be somewhere in a range that evokes similar emotions as 1200$ did to those intimate with the technology back in 2013. This said, an argument can be made about a different, more educated, market landscape today - less willing to sink too deeply too quickly.