I don't know about "redesigned in a year or two". Automotive generations tend to run 5-7 years depending on the company and specific model (at least that's the case with every car I've owned). There might be a minor refresh within a generation (see early 3rd gen 4Runner compared to later examples), but they're essentially the same vehicle. These days, I'm seeing more transmission choices at the low to middle levels (manual, automatic, automatic with selectshift, etc). Where you see fewer transmission choices are in the vehicles that traditionally had manuals available (trucks and sports cars). With improvements in "automatic" transmissions (automated manuals being the biggie these days), you're seeing more vehicles in those categories simple go auto without a manual option (or as an "upgrade" rather than standard offering in the case of some sports cars).
I just bought a 2013 Ford Focus. The difference between the low end and top of the line is staggering. Some of it is cosmetic, but you have choices in engines (flex vs regular), transmissions (DCT 6spd vs manual 5spd), 3 different stereos (HD/non-HD, with/without satellite radio, sync, etc), suspension packages, interiors (with multiple options there), keyless entry/start, sunroof, winter packages, wheels, etc. Then there is the ST version, which is the same car, but with upgraded suspension and a very different engine and transmission.
A base model S with no options is so different from a Titanium or ST it might as well be a different car.
Chris