Luckily for 3rs fans, Sunset has shown the ability to do both without major compromises.
Certainly 3rd Rail isn't Key/GPM/Kohs in fidelity but SS/3rd Rail give the most bang for the buck in the hobby today.
The biggest issue would be at what point do compromises to make both 3r/2r start driving away the 2r share of the offering.
Only Scott and Co. know that point and I suspect they do this exact dance when they offer up a new model.
And they seem to be doing darn quite well at it.