Yeah but let's have a think about this, in a few years, then that capacity would be matched or beaten by:
United
City
Arsenal
Spurs
Liverpool
West Ham
Chelsea
Newcastle
So yeah they may get a few people walking through the doors (but as a percentage of income, gate receipts mean very little these days, especially as Glasgow can't demand London prices), but a decent capacity means very little, they'd be one of nine or ten teams able to get 55k plus average gates. There's absolutely no guarantee they'd be any more successful than anyone. Look at United, one of the largest teams in the world and have had 70k plus for the best part of 20 years and they are about to finish outside the top four for a third time in four years.