Sorry, didn't really clarify what I meant by mainstream: easily available to purchase, by non-techie consumers, from a high-street shop.
It was pretty nice a decade ago, when everyone was moving to LCD monitors that were vastly inferior in every measure beyond size or weight, but, at least in terms of ppi (and on consumer grade equipment), display technology eclipsed the CRT quite a while ago.
edit: I'd forgotten that CRTs were measured with the bezel included, so at 20" viewable, the display is 128ppi. So closer, but still pretty far behind.