There is footage somewhere of two incidents I recall. One is where a ball was heading for the empty net and it burst and didn't cross the line, the second was where a ball was goal bound and hit a bird or dog or cat? Point is, unless the ball crosses the line a goal cannot be awarded.
The options are few: replay or replay.
You can't reverse a result of a game, it would not be defensible in court and would lead to countless similar suits, not least the 1966 World Cup Final (however, cancelling Hursts goal would still leave the result 3-2, so that would be a hard case to win)
All that can be done is dish out punitive action against the Physio, against the club for failing to control it's staff and possibly the referee because he could have awarded a drop ball on the goal line.
I would also question the fair play of the club who benefited. It may have been an important game, but the coach should have ordered his players to concede a goal. We have seen many magnanimous sporting gestures, not least Paulo Di Cannio.
This was an entertaining episode that will become a collectors item, but if the offending team had manned up and conceded, punishment would have been light. Now the wrath of world football will fall on the physio.
But it proves the old saying: The game ain't over until the fat physio is controlled!