How things pan out remain to be seen, but in G7 racing, virtually never, are racers changing motors every heat.
In G7, there is OMO and TMO races.(1 and 2 motor)
One motor, two motors, eight motors, the more it looks like "real" racing moneywise and effort wise, the fewer participants there will be.
Example: about 20 years ago a guy and his 2 adult sons stopped by to show me their RC drag cars and lamented the fact there was little interest in anyone racing with them any more. Then they proceeded to tell me that the cars cost ~$1500 each (and they didn't just have 3 cars).
I know it's all just expendable income but if one wants to have plenty of players in one's sandbox, one should make playing as affordable as possible.
Group 7 used to be the ultimate slot car class: fast, reliable fun where I raced the same c-can motors in several races against a turn-out of 40 to 60 racers in 3 driver classes. It was easy to get people involved in racing by showing them that it was quite possible to go really fast with a minimum expenditure.
In this particular discussion, motors that are potentially cheap, reliable, fast AND consistent is a win, win, win, win that is almost unbelievable...almost as unbelievable as the conversion over to the sealed motors (which are flawed by their inconsistency for racing but are a superb product for lowering the costs of just playing with slot cars).