I thought the points about stadium expansion made by the Liverpool owners recently were interesting - that a new stadium just wouldn't be worth the money. If our owners are thinking about this in terms of long term finances then how much difference will 10,000 extra seats make? Even if they bring in £1000 a season (more than they do now), then that would be £10 million, and that's without considering the many millions it will take to restructure an existing stadium.
Given that we can't charge £100 a ticket like Arsenal, if there are modifications, aren't they more likely to be restructuring what we have to provide more corporate capacity?
When you consider United have a training kit deal for £10m a season, and that we've increased out commercial income by tens of millions a year already, I suspect there are much easier ways to get cash.
Bayern have a commercial income of £160m+ and I would expect our owners to be using their influence to increase ours over the £100m mark, rather than stressing about adding a few thousand extra seats in a disruptive and expensive manner.