Its a fun exercise to explore the possibility thoughDon't expect friction brakes to go away anytime soon.
You do have a point with the TM only having one front motor, that likely won't absorb full adhesion regen, but it wouldn't be possible to have a single motor front braking anyway, you need a motor per front wheel to modulate ABS otherwise you'd be going off-road faster than you think
But if we're on the subject of wishful thinking, another thing I'd like to see is the brake rotors on the motor side of the axle shaft. Especially on a off-road vehicle, that will keep it out of the dirt and dust a bit more, plus protect lines from brush, rock scrapes and mud, and lowers the unsuspended mass of the wheel. The thing they need to do though is make the motor hollow and put the axle shaft through it to the middle to make the axle/suspension arms as long as possible to increase wheel articulation as well.
Then chuck a planetary gear in the hub as final ratio (adds some weight again) but gives you portal axles like a Unimog. Huge clearance right up to the wheel. Then add inboard suspension as well and a central tyre inflation system (easier on a portal hub) and four wheel steering with crab and counter steer....then we'd be rocking! :-D
(P.S. Answer to your previous question customized 200 Series Land Cruiser and a "Bushranger" Range Rover)