Long term, yes of course. Gatwick suffers by being in Heathrow’s shadow. It lost a lot of its long haul after 9/11, it lost a lot of its long haul after the recession (which also coincided with Bermuda II being scrapped), but in the years after, the usual constraints on Heathrow return and long haul filters back over to Gatwick again.
There’s no need to fear, aside from prestige, long haul isn’t what brings the bacon into Gatwick and the local area. It’s nice to have a daily Cathay A350, but 67 (going up to 71) based easyJet Airbuses is what contributed the most to the record passenger numbers (pre-C19) and provides great swathes of employment to the area.