When you look back to 9-3 that was the last fglrx driver with r300-r500 support. But you can still get a win driver for those. Most likely because win does not change the abi so oftenfglrx is weird in several ways, the fglrx devs do not even add community patches to allow usage of newer kernels, no they just keep the same code forever and require externa patches. Dropping support for hardware that is still sold is just one example, there much more where fglrx does not shine. fglrx supports ubuntu releases, thats clear because ubuntu always gets prereleases where others distros do not get those. 8.96 is in precise, all others have to use 8.96 from the opencl preview, but that lacks some pci ids in the beloved /etc/ati/control file. i mentioned often enough that that those checks using the control file and the same hardcoded pci ids in aticonfig is complete nonsense but nobody ever wants to change that. amd only fixes things which they are forced by ubuntu and if somebody else has got ideas what could be improved -> just ignore it.
It will stop putting off newbies (and hinder adoption of GNU/Linux distros).
At most forums, fglrx figures prominently in a large number threads started by newbies.
Except when they get a popup asking if they would like to install a restricted driver for their graphics card... Question to Ubuntu based users - does ubuntu ask you if you want to install a restricted fglrx driver for your card if it won't actually work for the card you have? I.e. they do keep a DB of working/non-working cards for the current fglrx and the X.org & kernel for the current release?
Most likely they will go down the same route the Nvidia drivers do. If an older driver is still "supported" by Ubuntu and your card will work with it it'll still be recommended, so as long as 12.7 or whatever runs on 12.04 it'll get recommended for installation.
The official comment for win8 is nice too: win8 will ship with the last supported hd2-4k driver, no downloadable win8 driver will support those cards. Find a bug? Tough luck.