It also depends how long the fans were on for?! If they were 350 degrees and you taxi from the stand and then turn them on for 5 mins and get airbourne, then you will most likely find that when the wheels go into the bay that you get an ecam saying they are hot (>300) as they will hardly ever cool in the wheel well. The issue you then have is very hot brakes in the wheel well. Not really a great position. If you have 250 degrees with fans on and don't want to delay takeoff then turn the fans off and get airbourne, leaving the gear down for 2 mins. Works well. Obviously an RTO should be considered.
IMHO the takeoff decision was incorrect.