There are plenty of ITG cabs in the area already. Fiesta EX, on the other hand, is nowhere to be found.
Gameworks, being a heavily corporate group, is probably not that likely to pursue a game that can only be bought used and was produced by a now-defunct company. Regardless of the techs' opinions, usually someone higher up the chain will see that as too risky a purchase - they might have gone for a used cabinet if there was still some kind of support you could get from Roxor (they passed support onto some other company after they settled with Konami, and that company no longer exists). Even if they got a machine despite the risks they see there, they definitely wouldn't allow nonstandard content, since hacking the machine would be seen as risky, plus most of the custom content out there is copyrighted (so USB customs would not be enabled) - being a subsidiary of a pretty large company, they're visible enough that they actually have to worry about lawsuits.
Fiesta EX would be more appealing to them, since it's legal and currently supported. It would be more welcome to serious players, too, since even if players really wanted to see more ITG in the area, Gameworks would not be a good place for it.
Then again, even when their machines were consistently better, Gameworks was always a terrible place for serious play. No outside drinks (not sure how much they enforce this rule for water bottles, but a bottle would last me no more than two or three sets), no drinking fountain (so even if you had a bottle, you can't refill it), and the vending machine (if they still have one) was always jammed - unless you're old enough to go up to the bar and wait for the half a dozen people in front of you, you can't get water. Pump and ITG would be very impractical games - at least for me - under these conditions.