this made very little sense to me.. but let me try to answer it
there is a soft cap that comes in around 20K people will need to explore the response for themselves.
thx this answered it, it sound for me that arena size was the key, not attendance only ;)
building down happens immediately I believe, so i don't see why it would take a season to do.
because of that(and building 10k seats nearly takes a season):
It will take approximately as long to sell a group of seats as it did to build them, and they can be sold for the same construction price. You will receive the money for the sale only after the contraction is complete..So if the arena is decreased immediately, and you just get your money at the end. I like to know if you could downgrade the arena again, before the first downgrade is finished?