I'd argue that depends on your accent. I'll grant you that "he's" is probably a bit tricky, but I can totally see people writing "hers", stopping, looking at it

I'd argue that depends on your accent. I'll grant you that "he's" is probably a bit tricky, but I can totally see people writing "hers", stopping, looking at it, "Hm, ownership... apostrophe!". EDIT: To be clear, I'm not greatly bothered either way; I got over my prescriptivism a while ago. I'm just curious whether the trend will continue.