What will be the cost of certifying electric motors as replacement brakes in EACH TYPE of airplane? How practical is it in a 737 or A320, where 2 motors (asymmetric braking as a "normal" condition is untenable) represent 50% of the braking power? Will the motor mfgr/vendor do it? Where will the energy generated by that motor be stored or dissipated? There aren't any batteries in ANY commercial airplane capable of taking that kind of charge rate, so any additional batteries, cabling, and/or heat sinks will be additional weight.
AFAIK, none of the vendors concerned has ever suggested that their systems would provide a braking capability, for the reasons you have described.