(BTW, if the show is really hurting for money, why would they spend money redesigning the console room after they already redesigned it a couple years ago?)
They didn't have a choice. The old (old!) set was literally welded to the foundations of the previous studio (BBC forsesight at it's finest!), so when they moved they couldn't take it down and rebuild it.
Hence the new smaller, cheaper set.
Huh. I didn't know that. Why did they have to move? And why didn't they figure on this in the first place? Didn't they have to move the old Eccleston/Tennant console room between Seasons 2 & 3? And wasn't that a total pain in the ass because it was never meant to be moved?
Still, I kinda like the new, smaller console room if only because it reminds me of the console room from the classic series.