An interesting idea.
A few observations:
A. The width of the catenary contacts are the result of the same problem which forced two right-left contacts on the old electric buses, that is, the tendency for vehicles not on guide rails to move laterally.
B. Like steel rail freight transport, the efficientcies of such a system would go up with the increase in number of interconnected vehicles (think of an electrified Australian trunk train). However, the lateral movement problem, related in point A, and, the need to control it, IMO, would increase exponentially per trained vehicle, unless each 'pup' had some degree of electric motor traction.
C. Also as in steel rail transport, vehicles cannot pass one another unless this is permitted via the overhead wiring, unless the vehicle switched to batteries. This, IMO, would likely have to be done at reduced speed and on a a secondary catenary line.
D. Again, as in steel rail transport, unless passing overhead catenaries are provided, vehicles either will have to travel at approximately the same speed or far enough apart to absorb variations in speed.
E. If very efficient off-and on supplied electrical power system switch could be provided and a constant speed on the wired route be provided (enforced) then a mix of public passenger and freight traffic could be provided on the same line, which might appeal to the private sector.
F. All vehicles would have to able to maintain speed for a distance Y if one or more tires went flat, particularly as the density of vehicles per unit distance increased.