It really will depend on which altcoin you are planning on buying right now.
Because right now, some altcoins have decreased in price after the pump while others have continued to increase price. It's not a good idea to generalize all altcoins into one bracket/index since you're not going to realistically going to buy into all altcoins.
But if you were, bitcoin will probably likely get pumped again, meaning altcoins will go down somewhat.