As far as buying fonts, I don't know whether this will come into fruition. You might notice that "Get Fonts..." is still available in the pop-up menu in the font panel.
However, I don't think people really buy fonts much anymore. I remember the days when you only had the default ones, namely BEFORE the internet and advanced typography tools - you could buy a whole ton of clone fonts for rather cheap ($29.99, KeyFonts for example) or those clip art packs that supposedly would come with "thousands of fonts". They were basic fonts with little thrills (usually the companies give up when they come to non-alphanumeric characters and such) but if you write a newsletter in your spare time for your church, hey, it gets the job done. And when all you've got is black and white, sometimes a snappier font will help make it all the more interesting.
Then there would be the "make your own font" where you write out the characters and send it in and get it back weeks later - the forms you'd find in airplane magazines on flights going overseas.
Nowadays, ordinary people and small upstarts businesses have produced their own fonts easily for download.
Unfortunately, downloading fonts isn't easy. Just like warez (which no one should be doing anyway... tsk-tsk) you have all these sites who compete for top 10 ratings claiming 1,000s of fonts that only redirect you to other sites that claim they have just as many or more, only to give you endless pop-ups and the same sites again...
I think the art packs still exist, but buying fonts is all but extinct, except from the actual type foundries, which I think in general are getting a little bit economically justifiable.
As for me, I have plenty to last me a long time. Many of my programs have come with fonts (AppleWorks, WordPerfect, etc.)
So getting back to the issue/question, I think the reason Apple hasn't ventured full throttle into this is because I don't think the demand is high enough. Although I love typography, when it comes down to it, I think 90% of consumers (non-industry people) feel they have enough to work with, and when writing reports, all you really need is Times, Helvetica, or Courier.
