I think no, there is no harm for bitcoin if the altcoin price up. Can you see the marker correctly? Because in my opinion all altcoin price market will be pumped when bitcoin price is already pumped. I mean, most investor will trade in bitcoin only when bitcoin price getting pump so as it will affect to altcoin price thaf will be dumped a lot. And when bitcoin price meet a sideaway market the investor will pump some altcoin. As you can see there is no altcoin who successfully reaced the previous all time high, if you found it can you tell me. In this bull run market I suggested you to trade or invest your money in bitcoin only.