Jet2 are slowly creeping away from city destinations, they make more money sending the 737 on a rotation to the med. They are going to tackle the charter market but still offer seat only as well. Rumours are stronger than every about imminante long haul on the 757 to east coast USA.
I think the LGW would be better served by a smaller a/c type such as 146 (Personally would love to see E170 lol) but they are low cost so the fleets need to remain common. its wierd as the LGW not long went on sale uptill Oct 31st ths year! they should do what LTU (Air Berlin) did in Germany to op domestic flights, they had WDL doing domestic on 146 for a bit