Waiting for WBE is risky in many ways, but I don't see a potentially realistic plan that doesn't go through it, even if we have (somewhat) smarter humans. This path (and many variations, such as a WBE superorg just taking over "manually" and not leaving anyone else with access to physical world) I can vaguely see working, solving the security/coordination problem, if all goes right; other paths seem much more speculative to me (but many are worth trying, given resources; if somehow possible to do reliably, AI-initiated WBE when there is no human-developed WBE would be safer).