Nah, I mean, how is that any different from Contacts, Calendar, Notes, and iCloud EMAIL that they already do store? Why would Messages considered so much more precious?
Not to mention, Message archives are currently part of the iCloud backup, anyway. Restoring from an iCloud backup brings them back onto a new device. So your logic seems flawed to me.
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I heard it worked fine; beta testers I know who were using it without any issue were wondering why it was removed. I'm guessing not everyone had the same experience. However "Messages in the Cloud" for proper syncing between devices is different from a "web front-end for Messages in the Cloud, so it can be accessed via PC." I'm doubtful we'll ever see the latter (even though I'd love to see it!)