If bitcoin was to skyrocket again, no one knows what percentage increase we would have. Not to mention bitcoin isn't guaranteed to skyrocket in the first place. Not because it happened in the past, while definitely not impossible, it doesn't automatically mean that it will happen again. Who knows? We might have a very slow increase for a decade this time, or even a decade of price stagnation?
It's either going to skyrocket soon after the halving like previous halvings or it's going to die a certain death. With bitcoin there really is no in between, as Satoshi said it's going to either become worth a hell of a lot or nothing. Barring some unforseen disaster, I think the odds of it dieing are sliim to none.