Vendor diversification? As in Apple has diversified into computers, phones, tablets, TVs, music players, music sales, software sales...? If it's vendor diversification you like, you might want to hope that Microsoft manages to become a player in phones, tablets, etc., too, because otherwise we'll be stuck paying Apple-sized margins on hardware, software, and services.
Of course, my first choice would be to see Linux become a major force on more platforms in a power user (not consumer) form. Watching Apple, Microsoft, and major chunks of Linux in a race to convert all platforms to the "I don't understand folders, I just want my Facebook and buttons to poke to buy my entertainment" market makes me wish for someone to target the power user machines for getting work done market that everyone else is getting out of.
Of course, my first choice would be to see Linux become a major force on more platforms in a power user (not consumer) form. Watching Apple, Microsoft, and major chunks of Linux in a race to convert all platforms to the "I don't understand folders, I just want my Facebook and buttons to poke to buy my entertainment" market makes me wish for someone to target the power user machines for getting work done market that everyone else is getting out of.