Stomping your foot angrily at ISPs and Internet facing entities to adopt a protocol noone cares and/or getting governments to intervene because you've exhausted all your options and progress is stagnant is not a transition plan, that's a hail mary.
If you can't enforce a flag day then that's all you're left with, isn't it? Other than maybe hacking into people's networks, upgrading them and then somehow preventing them from undoing your work.
If you ignore those then sure, it didn't have a plan.