Its almost a shame they can't do anything seating wise in the new pier- that would at least act as a feed out of the main airside zone. However, I understand the airport had to level with the council when regarding capacity.
Interestingly when I was last flying out of Bristol, Air France/KLM/BMI were all departing from gates on the new pier. Would have been nice to see at least some seating around the boarding gates.. albeit I understand it wasn't allowed.