Yeah or a massive drawback including all currencies
Either is possible but given all the solid fundamentals surrounding a few coins I tend to lean more on the side of alt party then drawback of market. Also given the acceptance level of cryptos now I think it is more likely alts party because it is less likely people have a stigma about getting into alts due to the fueling of criminal activity.
I think you are right in that we will see a good period for alts and they will gain back some of the market. Even with bitcoin growing, the new money will not all go in to bitcoin, some will also find its way in to alt coins. I'm expecting to see them have a run some time in the first quarter of 2018.