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?
That is the problem of many bitcoin users. They always think of bitcoins going to the moon and skyrocketing without thinking that bitcoins is basically meant for peer to peer transfer and not as investment vehicle to give much profit.