Yes, a geometric increase is what I meant. Gavin's current proposal is for it to double every two years, meaning it increases 1.4X every year, which gives it a reasonably high chance of staying behind consumer bandwidth growth (and thus keeping the network highly decentralized).

So to answer your question, yes I would support something along the lines of what you're proposing. I think 5 MB would be much better than 2 MB though, because Bitcoin has a tendency to see sudden spurts in adoption, and so it'd be nice for it to have some room to grow quickly in the coming years.

Thanks for posting.

And I think one thing that often gets lost in the discussion on the hard limit, and that I can't stress enough:

There are other ways to stop bloat besides a hard limit in the protocol. A protocol limit is the most crude and inflexible way to counter spam/bloat. If a 40-50% increase per year ends up being faster than connection speed increases, it is very unlikely that other means will not be found to limit block sizes.