I don't think any of us have ever seen SEN as an airport for longhaul or wide bodies, but I never envisaged 5 years ago there would be A320s operating directly to/from the Canary Islands. I can see, however, SEN getting busier over the next 5 years with types of aircraft that are currently operating into LCY, plus slightly bigger ones like the Fokker 100, CRJs, etc which dont go into LCY.
DASH8 and ATR72s are ideal aircraft for a 90 minutes flight to anywhere, and I believe most travellers are quite happy with that. On this forum there will always be those for/against, believers/non-believers, but nobody knows for sure what the scene will be in 2021 and beyond.