Great news about Jet2 opening a base...
Two UK airports getting new airline bases in less than a week!
I don't think easyJet will be running from Liverpool, while the airport might be playing second fiddle to easyJet's Manchester operation and you haven't seen any growth in recent years, that's the same at many UK bases for easyJet.
While the Luton base is much larger than Liverpool, it plays second fiddle to Gatwick, and Luton hasn't seen any easyJet growth in about 5-6 years. When new routes are announced at Luton, it usually comes at the expense of another route getting the axe or a frequency cut to an established route.
EasyJet are very shrewd and I think we have to face it, unfortunately Manchester and Gatwick can demand higher fares for routes and are more profitable for the airline. That being said, I am not in anyway saying easyJet are making a loss at Liverpool, and if they were they would have left years ago.