@_ck_: I think Automattic's stats on 13M WP installs trumps your 6K. Also, 95% of all statistics are crap. No, really -- I've got numbers to back that up.

Migrating WP to require PHP 5.3 isn't likely to happen for quite a while. PHP 5.0? Yes. And 5.2 might not be *too* far off (comparatively speaking). But 5.3 is a *major* change, and as mentioned in the chat log, even a lot of developers don't have 5.3 installed on their dev servers yet. It's not only brand-spanking new, it has some pretty major changes under the hood that can break compatibility (or certainly at least cause new warning to be generated).

Any web host still on PHP4 that doesn't at least offer PHP5 as an option BY NOW is just asking for a world of hurt via lost customers.