If it's hard to click the "more search options" link and choose Google, then you deserve whatever Bing serves you.

Wait.... matching quick service casual and sit down dining against fast food? This should have been broken into 3 "leagues".

I was going to say: "1 reason it shouldn't: SD card". I'm less concerned about filling the phone and more concerned with retrieving my data in the even t of a catastrophic failure of the device (either physical or software).

While I'll admit it was several years ago, Walmart sold a line of PCs w/ Ubuntu pre-installed. Changing OSes is no small task. Little things you do on a daily basis are slightly different, and it can be a real hassle, or waste of time, while you are trained for the differences. I think that having Linux available (a quality distro that is) as a preinstalled option on the shelves of big box retailers would certainly increase adoption, but only if the support was there from the OEM. I'll go further to say that it will require a good rolling release distro. The average end user isn't going to put up w/ reinstalling every 6 mos or suffering quickly ancient software because they didn't.

Even at that, with the keys in authorizedkeys instead of authorizedhosts you're still covered, and you could carry your private key (password protected, of course) on a USB drive.