We have lived here for over seven years and every winter Ryanair have suspended or seriously reduced services between Reus and the UK.  It isn't anything other than an inconvenience.  As Cactus Jack said it is a business and if they are to provide the cheap service that they do they can't fly half empty (or worse) planes and still offer €40 fares.

I certainly haven't stopped using Ryanair and if I was going to fly from El Prat I'd still use them as they are cheaper than the others.  If Easyjet were as cheap I'd use them, but they aren't.  Really, really wouldn't use whatever Russian airline AENA are hoping to out into Reus, ever.