Yes, assuming they're changing it to the format JP has, another one will open next week, then the week after FF7 will rotate out while another takes its place. The end result should be 2 torment dungeons open at any given moment, rather than all or nothing.
I don't see why they couldn't open FF3 torment before the full throttle update with just D200/D250 available. The banner for it was translated, so theres a good chance of it appearing in the rotation soon.