Increasing the capacity of stadiums beyond 200k is, quite frankly, ridiculous.
Maybe there should be different kinds of stadium upgrades which could reduce mainetenace costs:
Such as installing solar panels, wind turbines and other environmentally conscious features that would save energy and reduce carbon footprint. Maintenance costs (i.e. energy costs) would then come down (but not too much).
If the cost/benefits were pitched right and made so that smaller stadiums benefitted more from these improvements (relative benefits decrease the larger the stadium is), it would help newer users by freeing up money they spend on maintenance already. Allowing them to catch up sooner without doing so by penalising longer term users.