Btc has run too far too quickly possibly due to manipulation by hedge funds. But it wont crash too hard I think. By guess is undervalued alts will rally hard now. Just a guess
In time alts will definitely have their bull run and catch up to where they should be relative to bitcoin. I think that it won't be for a few more weeks as bitcoin is still growing quickly on the back of futures speculation and new investment having passed 10k.