It wouldn’t be impossible for the island to incentive easyJet to provide a night stop, easyJet have previously been persuaded by places such as Inverness…..it just depends on the level of funding provided. Based on the abrupt end of the LM LHR service, the level of support is likely to be low.
With occasional dates seeing high fares and overall fares seemingly a little higher, easyJet will add more flights if they deem them to be delivering enough profit, or more than alternative destinations from the LGW network.