Altcoin bubble probably. Partially due because bitcoin didn't grow as expected for long time, partially now driver by the general market euphoria.
Bitcoin bubble I don't think. There could correction in price, but I don't think can drop very much. I mean hundreds of dollar possible, if not probable, but not a suddenly drop at 1000something value. I don't think it will fall shortly under $2000... I'm wondering indeed what happen when segwit activates. Do the markets already anticipated it, or will we see another surge?
It is interesting to see, looking at the chart, BTC took one full year after the mtgox collapse to hit the bottom...