In my view the runway width isn't an issue.
Except that it becomes an issue each and every time a further runway extension is suggested ... "Oh sh1t, we can't do that because the runway isn't wide enough".
Then it restricts ILS capabilities, perhaps a shame that Stobart's have thrown such a bucket load of money in to SEN yet they shall remain in the lower leagues whilst they have such a handicap.
The 737-800 'issue' if you can call it that. Well, who cares?
I think that when you say "B737-800" and "who cares" in the same sentence you are thinking of just one obvious operator! ... Yes, who cares
But SEN should care, if as suggested the majority of B737's in Europe are 800's then that is a hell of a lot of potential business SEN could be missing out on, then there are these MAX and NEO thingies, whatever they are, coming along whilst with the runway width as it is SEN can't even accept a wide body.
As Tophat previously remarked it's great to see Airbus's launching to the Canaries, that's the Canaries and not Spain
, but there could be so much more if only they could, or would, widen the runway.