The rubber bands are not strong enough yet for the cost/weight. You need a lawnmower size motor or a big hydrostatic set up. Otherwise the new pic em up trucks would have them instead of eight speed auto transmissions.
The technology might be like direct fuel injection for gas motors. It took forever for them to bring it to market, where diesel has done it mechanically nearly forever. (Long, long before computers)
We own a sentra with cvt. Car sucks balls. Trying to convince her to let me total it since we have full coverage on it.
However i can see the positives in dudes tractor though.