I think one thing we can definitely say is that any decision to expand/relocate/whatever won't be motivated by the simplistic, "more fans in the ground" = "necessarily better" logic often espoused on here. A decision will be taken because it makes long-term sense, not to massage the egos of fans who want to get excited because they have a bigger ground than some other club. "More bums on seats" does not necessarily equal "more revenue" when some of those seats require investment, which is fixed and forever, against attendance, which is uncertain.
Cortese seems to be thinking big so I expect we have modelled various scenarios and have drawn up certain tentative plans but you can be sure they won't be predicated on simply getting more bums on seats.