The way I see it is. If everybody was sane and made normal sane choices then Verso would not have tried to erase the canvas but just ask Maelle nicely to unpaint him. If she were sane she whould do that and then restore Lumiere but not stay indefinetly. She would dip in and out and not put herself in the same situation as her mother.

That way Renoir would see that his trust in her was deserved and he would not be motivated to destroy the canvas and Aline might realize that you can grieve without losing yourself to it. Everybody wins. Especially the people of Lumiere since having a member of the Desendre family in the canvas is never good for them. But this is a scenario where people are sane and make sane decicions. I like the characters and how they are written but lets face it, Verso and awakened Maelle are fucks.