I don't really see email as any more secure than snail mail right now (which can be taken from your mailbox and read, albeit with stiff legal threats if anyone catches you). There wasn't an appropriate poll option for "I don't care because I don't think email can be both effective and secure in the near future and I prefer effective".

People who need encrypted email will figure out how to do it and I think that's enough for now. I don't think lamenting how slow PGP adoption is makes sense, though - it will never, in its current form, be mainstream.