GRJ is right, it's unlikely that anyone is going to buy an engine for which there is no support system. I don't think there is a large market for $300-$400 upgrade kits, not to mention any install cost.
As others have said, it will be interesting to see how this plays out. Other companies foreshadow with tooling broken up and sold to various companies which installed their various electronics systems. Even Lionel couldn't/wouldn't keep ERR going at their price point.