Of course, identicality means that a local failure can escalate to cascade failure rather easily - think Slammer with its 8.5 second doubling time. Unless you must simulate dumb customers or something like that, a better problem statement would be:

Maximize net cumulative productivity.

That's a problem statement which would naturally lead to operational strategies like:

All applications must be platform independent
-and-
No OS may control a majority of platforms.