It is no longer new that the performance of other coins solely depends on Bitcoin that is even few of the other coins so what is in for other coins will also depends on what Bitcoin will be doing too,
That is true that most of the altcoins if not all are too dependent to the action that bitcoin does.
Bitcoin is the king and it is always at the frontier before any other coins, hence what is in for other coins will surely be based on Bitcoin movement after the halving.
No contest, Bitcoin is king and that's why if someone don't have the urge to invest on it and likes to move with altcoins, your choice - your gain.