I think kds1 is unemployed and is using the forum to post his/her resume instead of giving solid reasons for not wanting multi-user support. I'm unclear how kds1 feels about Windows, though.
User profiles work under OSX/Windows and there is enough evidence that (over time) desktops are being replaced by tablets, so why not? The problem is, tablet makers are stingy when it comes to memory and storage. Those need to increase in order to handle multiple users.
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Get separate iPads for kids, or other family members"? Right. Let me refinance my house and see if I can squeeze enough equity out to furnish iPads to my entire family.