As iOS evolves, I keep using the same question to gauge its progress: what is it that keeps me going back to the Mac? The list is shorter now than it's ever been. Clipping to Evernote is now easy in iOS 8 with their Safari extension. Using 1Password is now as slick and integrated on iOS as it is on OS X. There remain a few stumbling blocks, but not many.
I ask myself what it would take for me to completely eschew owning a Mac. I'm not there yet and I'm not even all that close to it in practical terms. Like your pal that doesn't have a car but who can only do so because you give him a lift, I could possibly do without my own personal Mac only because I have access to Macs at school.