Or, you know, the fact there's an entire subforum for 10.0 now instead of just this thread. This happens pretty much every time until the alpha/beta starts up and builds start rolling in.
By that logic, those arguing against the reuse of assets/rigs are effectively arguing for less content, so yeah, by all means reuse rigs/assets. I'm sure the next world revamp will reuse a ton of assets from the Dragon Isles in e.g. Northrend as some zones are pretty much the same themes. Garrison assets are still getting reused today. I don't see how any of that is a big deal.