[untog]

Will other vendors follow suit? If they don't, they'll be left in the dust, so I imagine they will have to, if they can.

Said the designer. People were still buying SD TVs years after HD ones came out. I don't disagree that it is good to skate where the puck is going, but it's still too early to worry about it now. A lot of the web design we do right now won't even still be used in three years time.

Once my Mac has a Retina display, I will design for Retina, and let the lower-res experience be inferior.

Terrible, terrible idea. It was only a few days ago that someone posted how ignoring Windows cost them dearly. Don't ever design for the machine you're using, design for your customer. This applies to screen resolution, processing power, everything.