It will be fine to remap. Dont be surprised if you start getting clutch problems though. Turbo might start coming to an end of it life at some point aswell. This is all guess work really, could go on for ever, depends how well its been looked after.
Me personally, I wouldn't. Id either get a car with less mileage or just not bother risking the agro and cost of it all going wrong, but thats just me.