Worst case scenario, I don't think regular Blitz 3D has passed its usefulness in developing casual (or any type) of games for Windows. If the code is as easy to port over as they say, it should only mean a little extra work to get your Blitz Max versions up an running based on your original Blitz 3D code.
In theory, anyways - don't know how well that works in practice.
In theory, anyways - don't know how well that works in practice.