I think a bigger question is due to the current climate on traveling, do you need them back anytime soon? Regardless of when the parks reopen, whether that's April 1st, mid-April, or into May, I feel like people are still going to be holding off traveling then or unable to travel at that point. Everybody I know rescheduled their Spring trips for either next year or this fall, and when things return to semi-normal and restrictions are lifted they will be returning to normal working situations and excited to do so. Even when restrictions are lightened up a bit people aren't going to be able to drop everything and travel and put together a last minute trip, and I think people will still be holding off travel anyway. The airlines pared down schedules through September I believe, meaning they think the decrease in demand will last until then. When Disney reopens it's highly unlikely they're going to have the huge crowd levels at first, meaning they may not need their CP employees and may focus on getting their local staff hours. I also kind of doubt Disney would ask the international participants to return even if they asked the domestic ones to, given the situation with international travel right now. Airlines and hotels are cutting employees even though they're still running and open and to me this is the same thing Disney is doing. When they do reopen (assuming it'll be in the next couple months), they won't need their full staff.
Again this is all conjecture, none of this is fact. I don't know Disney's current cast numbers, how big of a proportion CP participants make up out of the entire workforce, but it seems to me that knowing demand for travel is going to be lower the next few months regardless of whether they're open, getting rid of the CP participants and giving the local staff hours (and maybe having limited operations) is the move they'd take. If they do need the CP kids, they can likely quickly get some domestic ones back and going. Just my opinion.