OK, the 9100 is old now, so its ok to retire it and they likely go ttheir money from it), but the 9000 is still too young to be replaced with anything.
That depends on when the RV-350 ships.
The 9000 started shipping in volume in July. (Though there were rumors that the 9000 was "ready" a few months before that.) Sounds like RV-350 will ship maybe in spring or possibly summer. (Exact timing probably depends on what nVidia can ship, and when). That's 9-months to a year between the 9000 and RV-350.
I would say a 1 year cycle for replacing the value part is about right, give or take a few months. And again, ATi is not "discontinuing" the 9000. they are making it cheaper by going with a different foundry for it, enabling the 9000 design to still be a money maker for another year or so. So it's not like the 9000 design only has a life of less than one year.
By the time RV-350 ships, 9000 won't really be young at all.
I'd just be wary as an investor that they're replacing their products too quickly.
I would be rather relieved as an investor, because
1) just because ATI may have a technology
ready to ship, doesn't mean they have to. Meaning: ATI is in the good position to be able to counter the competition, and set it's own timetable to maximize profits. (ATI controls more of its own destiny).
2) ATI is not simply replacing products. They are moving products down to cheaper selling points made viable by lowering the manufacturing costs, ala cheaper UMC foundry.