I'll play devils advocate.
I reckon the model of a WC every 24 years, a Lions tour every 12, pretty good years when England and Ireland tour and losses in all other years actually probably is pretty sustainable, especially with the World League cash injection coming.
Status quo probably just about works out over the cycle (although I think scrapping Giteau rule is inevitable)
I think we probably don't get to the next (home) WC if we employ a lot more pro rugby players, coaches and admin, which is what would we be required for any domestic comps. We go broke quicker than we do currently