I very much doubt he will get away with it whether he is demoted/sacked or anything else and yes 4 people were injured and thankfully no-one was killed. That said, the merciless slating on here by some who are holding themselves up as faultless paragons of virtue, when even they don't know the facts here yet is galling.
Even the plates make no reference to wing tip clearance restrictions on that taxiway. If the Skipper thought he was on the correct taxiway he would be unlikely to think he was about to clout a building in any case.