I've had my first beer to limber up for this evening, and I've thought on this a little. Whilst I don't think we can ever increase the capacity further, what we do have in our favour is our footprint. It's not like we're flanked by rows of condensed terrace housing, or a Sainsbury's local. So...
It is physically impossible, you can't mess with the structure of the roof, any improvement has to be contained within what we have right now. It's full to capacity, unless you want to scrap the 1901 for more seats in the West, or get rid of the brassiere in the East.