Even their current models demonstrate that Apple isn't completely over their obsession with shipping crap in high priced computers. As you've already noticed, the 9400 is a very weak GPU (albeit much better than Intel's integrated junk) and the GT120 (aka 9500) is the kind of thing you find at PC shops for $49 yet it's the stock GPU in a computer that sells for $2499.
I'm really hoping that once Snow Leopard is out that Apple demonstrates they're serious about OpenCL by putting better GPUs in all but entry level models. However the most recent MacBook Pro updates, which did nothing to improve on the anemic 9600M, suggest that Apple has no intention of ever giving us more than the bare minimum.
Apple is a fashion company masquerading as an electronics company.