This idea reminds me of what Go is doing with their channels to solve concurrency issues: they're essentially sharing data by copying the data.

Copying data is slow and that's why Go's channels aren't the fastest solution, but they're less complex than dealing with the traditional concurrency issues.

I've written a toy kernel and I just can't imagine copying all process data because 1 little thing changed. However, there's no reason not to pursue this idea, as it may prove to be useful in certain cases. If real-time schedulers have their place, why wouldn't such an OS have its uses? I think Go (and other projects) have proved the concept works, so maybe it's time to see an OS?

Best of luck to you and I hope to hear good news in the future!