I am just hoping that some more serious thought goes into avoiding the need to guess or extrapolate (an educated guess but still a guess).
It is offered as an example of the sort of thing that can work, rather than a finished product.
This is the problem.
People don't seem to realize Gavin's proposal may be the best we can do. I happen to think it is. If anyone had a better idea we'd have heard it by now. We, the entire community, have brooded on this issue for months if not years now. Here is a spoiler alert: nobody can predict the future.
Did anyone ever stop to think Bitcoin couldn't work? I mean I have, not for reasons technological, but for reasons of solving issues via consensus. Have you ever watched a three-legged human race, you know where one leg gets tied to the leg of another person? The reason they're funny is because it's hard to coordinate two separate thinking entities with different ideas on how to move forward, the result being slow or no progress and falling over. That may be our fate and progress gets harder the more legs get tied in. That's the reason for taking action sooner rather than later.
I've posted it before, but I'll say it again. I think a big reason Satoshi left is because he took Bitcoin as far as he could. With Gavin and other devs coming on-board he saw there was enough technical expertise to keep Bitcoin moving forward. I don't think he thought he had any more ironclad valuable ideas to give Bitcoin. Its fate would be up to the community/world he released it into. Bitcoin is an experiment. People don't seem to want to accept that, but it is. What I'd love to see is somebody against Gavin's proposal offer an actual debatable alternative. Don't just say, sorry it has to be 1MB blocks and as for what else, well that's not our thought problem; and don't just say no we don't want Gavin's proposal because it doesn't matter-of-factly predict the future, and as for what else, well we don't know.
Come up with something else or realize we need to take a possibly imperfect route, but one which could certainly work, so that we take some route at all.