No idea. He was funding them handsomely in L2 when they were averaging 3,500.
Attendances are driven by performances and success, which are largely driven by investment. I can't see Stags getting 4,500 again while they're in L1. If they get relegated and struggle in L2, maybe. Same with us and pre-Hardy attendances. It won't happen unless things go horribly wrong on the pitch, which shouldn't happen if the club is funded well.