I would be more worried that if they don't split up, they would have wasted several months that their competitors have been using to prepare for their new season. So, let's say that in July/August Katsalapov realises that he is not getting with Sinitsina anywhere good enough to be Russian number 2 or 3 and that they may not end up even being sent to competitions (Europeans/Worlds). So he will approach Ilynikh and ask her to skate with him and what? If she does, they won't be suddenly prepared to start competing together in September or October; they won't have programs etc. But if she tells him that she is not interested any more, she will be risking her career to skate with 'the worse' partner.
If they that did happen, they wouldn't have GP assignments, so they'd have a little more time, maybe do a senior B but that's all before Nationals, & then be ready for the 2nd half of the season. Maybe programs could be salvaged from whatever they'd done with their previous partners. But I think it's so unlikely to happen it's not worth worrying about.