Very cool CiviHosting. I wonder if your migration tool is open source? I guess it would cut a bit into your revenue stream to do so but some people may want to host their own...
Regarding the non-working features listed at
https://civihosting.com/wikispaces-migrator-tool/
I'd think it should be possible to support the boxes and videos by installing the wrap and vshare plugin in the new wikis?