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.
Bitcoin Gold's fork is pushing up the price but in the last months a lot of people discovered Bitcoin and are now investing in it, price will inevitabely crash by November. But I think it will reach all-time records by the end of December!