More competition on existing routes should help drive down LBA prices which in turn should claw some leakage back, I agree on that.
But Mrs Finger and I will not be alone in flying from elsewhere to destinations not currently served. We would dearly love to use LBA for all the flying we do but very few of the currently served routes are of real interest to us, and I am sure many others too.
As
@LBA4EVER suggests easyJet remain a very good hope to satisfy both those elements and ironically they already fly to both the recent non LBA served destinations we have been to from other airports, even though we didn't fly easyJet on either occasion