Feels like this is probably at or near the peak of the bubble for Turkey, don’t think that level is sustainable with other London airports also seeing multiple airlines and additional frequencies over last couple of years.
Not surprised Ajet has canned AYT.
I believe this is the first route to Keyseri from the UK although it has been well served for some time from other European countries including by TUI. It serves Cappadocia so could be of interest to tourists along with VFR.