AGP was 'abondond' as you say... Sure, there aren't as MANY products available for AGP as there are for PCI-e, but there are 1600 Pro, 7800 GS...
I THINK the term you were searching for is 'AGP is being phased out'.... It is the nature of the business... If there is progress to be made, why stick with older technology when the businesses selling the new stuff are going to take off, leaving you behind....
Look at CPU's as someone said... They are at 90nm process (AMD) and 65nm process (Intel) right now... The process gets smaller, sockets change, CPU's become MORE powerful while drawing LESS power & creating LESS heat....