Yeah, $2,800 looks like a bubble for BTC, but other crypto currencies still have the potential to rise. The higher the current price, the higher the chance that it will decrease. The lower the current price, the higher is the chance that it could rise. But it also depends on the currency and news about a certain coin.
What? I'd say all other coins are much more in a bubble than Bitcoin to this current moment!
To the old ATH (~1200) we are barely up 2x! The altcoins are up 10x, 20x, 30x, 100x.And they have almost no real use cases or advantages to Bitcoin! In addition to that are all those crazy ICO scams! When that 2 bubbles (altcoin and ICOs) burst, this
could mean a massive slingshot for Bitcoin and push it up $10000! Then we can speak about a bubble in BTC! Take Bitcoin's long term chart, zoom out in log scale and compare the actual situation to the precious bubbles in 2013, 2012 and 2011!