There seems to be a fair distance as well as a dihedral angle between the wings that might be hard to cross with a drive shaft. Without a connecting drive shaft a complete loss of power on one side would be a disaster.
Btw, is the airplane in your avatar a Norseman?
I would imagine that like any helicopter, the loss of power would require immediate and deliberate action to initiate autorotation without a substantial reduction of rotor RPM. Without a common drive system this helicopter should be still controllable with a total loss of power on one side provided power is immediately reduced on the other. Of course a power loss at low altitude or in a hover requires a lot of skill to make a landing successful, I'll bet even more so for this helicopter.
And BTW, yes it is, built in 1943 I believe, and now apparently sitting on a pedestal in Thompson MB.