If maid really touch to moon, what happen then to SP500?

My plan was to take some profit on some prices regulery and then invest to SP500 (or similiar world index), its this wise? Now as I writing this I get thought that if really maid can handle fiat? transaction (and will be without fee for payment) then I will still have time to exit sp500 position, its probably for years and I will see it if this tendency will happen no. Thanks