We won't have to make fonts for Retina - we already did, they're (usually) designed to be printed which is much higher DPI than a Retina display.. It wasn't until Windows XP when Microsoft said "Let's make fonts that look great on the screen, at low resolution"
Yes, that was my point (except it wasn't just XP– hinting was/is a PITA on any platform). These days we still have to make them look as good as possible on both, but if you're also targeting printed media then you're already set when high PPI displays are the norm.
