... close everything down, fire all the staff, then let the game run on max speed and sit it out until all these aging rides have become classics and are attractive again? Surely someone must have tried and lived to tell the tale. 
Edit: I am trying it now. It seems you can get the monthly balance change to exactly 0 by shutting down everything and removing any scenery that has a monthly running cost, except it keeps auto-rehiring shop vendor staff even though the shops are closed. I would have to set the salary to 0 on the newly hired staff, wait till they leave, then repeat the process again for the next auto-hired employee. This would make it rather cumbersome to have to always babysit this closed-down park. Or I have to remove all shops (just the actual shop objects inside the buildings) to prevent the auto-hiring.
Edit: I am trying it now. It seems you can get the monthly balance change to exactly 0 by shutting down everything and removing any scenery that has a monthly running cost, except it keeps auto-rehiring shop vendor staff even though the shops are closed. I would have to set the salary to 0 on the newly hired staff, wait till they leave, then repeat the process again for the next auto-hired employee. This would make it rather cumbersome to have to always babysit this closed-down park. Or I have to remove all shops (just the actual shop objects inside the buildings) to prevent the auto-hiring.
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