Honestly? I think there are worse things than my kids having to share their stuff with daycare kids. If they were little and had play dates, they'd have to share their crap with their "friends".

If my kids want to get away, or use stuff that daycare kids can't use, they just go to their rooms. No big deal. The daycare kids aren't allowed in their rooms unless they're napping in a play pen or invited by my kids.