Call me naïve, but I don't really consider current performance much of an issue - and therefore, I'm not particularly concerned about the TDPs of proposed upgrades either. The present unit is responsive enough, and arguably intended users won't be wanting to use it for gaming or graphics-intensive operations. Therefore it makes sense to maintain the actual performance more or less constant and concentrate effort on reducing thermal output and enhancing battery life. 10.6 will introduce the possibility to offload compute-intensive tasks to the GPU for processing: this will already provide a huge boost in performance for those few tasks (such as video compression and graphic rendering) that truly require it, an order of magnitude of enhancement for those users who will truly notice it without a need to revise hardware.
Insofar as the core system components are sound, I'd much prefer Apple to address those peripheral elements that enhance the end user's actual commodity of use. Hence my long rants about what external aspects I'm hoping they'll address (sooner, much sooner, rather than later).