I think a lot of the inertia is due to the fear that deleting an account could invalidate your purchases with that account. I've bought a few games and DLC packs myself--there's a lot of content I own* that I'd suddenly lose out on. It may be chump change, but I'm not about to walk away from money I've spent in good faith.

I think at this point if Sony would give us a cut-and-run solution to let us kill our accounts but keep our purchases--they won't--we'd see a surge in account deletions, especially after today's news.

Probably worth mentioning that I don't play many online games, so most of the time when I sign on it's to buy single-player content.