And the majority of people (and businesses) won't care.
The ones that do already have "Hi-DPI terminal windows and really sharp text" as an almost-mandatory requirement.
Think about it. Sub-pixel text rendering (and AFAIK it's just text, not images w/ subpixel positioning? although that's an incredibly interesting idea for a hack!). Maybe subpixel vectors/lines?
Either you care about high-quality lines or you don't... what Apple's basically doing here is moving the cost to the hardware instead of the software, and the win is simplified, faster, less-energy-using device.
I'm not personally agreeing with Apple's decision, I'm responding to your disbelief that "hi-dpi is the norm". It's the norm for anyone who primarily uses an iPhone. It's the norm for anyone using modern MacBooks (don't make me source my dates on retina displays). It's the norm for "executive" users (ie: software developers, graphics users, finance, book editors, etc.).
If you're happy w/ a bog-standard 1080p output device, then obviously you're not "in search of" the best quality text you can get.
However, thinking it through, I would _really_ like then a "subpixel mode" for either the OS as a whole (kindof like an FSAA?), or especially certain windows. Maybe there's a way to do that as a hack?