I could see $55K if there weren't thousands of coins and ICO's popping up everywhere.
People are investing into ICOs and other coins, because they perceive there to be better percentage returns on those.
That should tell you something very important - which is that at about $4100, a chunk of investors think bitcoin is
too expensive and are seeking other investments.
Other investments with bitcoin, alts are traded for bitcoin and they are used just to make more bitcoins. All investments are getting back to bitcoins in the end, and I don't think that other alts are slowing down bitcoin, its contrary. With so many alts and projects people have more things to do, more transactions are made.
Under the other investments are icos. People are joining and people invest in icos to earn some more bitcoins, can you see that? Its not important ico, its important how much profit someone can make in short time. After the end of ico most of the people are dumping that coins, the ones who entered in pre-sale and they have profit and after that coins are going down.