Not saying you're wrong that we will most likely see a crash before the fork, but I think you're over estimating the fact that this rise is due to Bitcoin Gold. Most of this new money coming in doesn't even know about this fork. It's going to tumble because we are moving straight up, and whatever shoots up will eventually correct.
I actually think a good amount of people do know about Bitcoin Gold. I think this is the case because of how Bitcoin Cash went in the past and also because of the widespread adaptation of the coin. The more people that use it, the more people there are trying to understand how BTC works and spread that info.