If people keep checking in online, Then LS will get the idea that they no longer need people?
And they will be put on the truck to timbuck2!!
Yeah that is true, however that's the joy of temporary contracts. All check in staff for Jet2 are taken on a temp contract, the permanent staff are the core staff needed for the winter, with summer staff exactly that, taken on for the summer, they know that and don't expect to be kept on, and believe it or not, that doesn't stop them from wanting to come back the following season.
You also have to consider there is natural growth within the business, yes a lot of people are checking in online, but they still need staff to man the bag drop desks. As was the case at LBA this year, Jet2 actually used more check in desks, requiring more staff than last year to accomodate bag drop, despite on some days there been less flights than the previous year. Jet2 will never go all online check in like Ryanair, so yes a couple of 'traditional' desks may be swapped over for 'online' desks each year, but they still need the staff to operate them. Unlike Ryanair, Jet2 don't expect only one member of staff to man the bag drop desks.