If they do a rollback, the HC server would be the only one since platinum actually matters there.
Platinum is fairly irrelevant on the regular servers, and there wasn't a large window of time to cause major economic issues on those. People have been raiding today on the regular servers, and had some very nice chest pulls of named loot and tomes. It would be a shame if those players lost those items that they legitimately earned today.
In the future, I will not be raiding or TR'ing right after a new update or patch is released, due to the risks of bugs and rollbacks.