I presume Mike's post was an honest request for feedback, so in case he's still reading, here are some comments from a newcomer to these forums but a long-time PC golfer (and even purchaser of Mike's Links courses).
1. I don't care about avatars. I care about golf. So, yes, an immersive sim with better physics, graphics, etc. is a good idea, and I personally would probably be willing to pay for it. But as others have noted, it would be a pretty limited market.
2. I still think the real selling point to JNPG is the designer and the realism of the real world courses. The screenshots a while back of what's possible in more recent versions of Unity had everyone salivating. It would be great to see that happen. I'd rather have effort put here than into avatars and such. Arcade stylings irritate me.
3. It seems like Mike's post implied that, for certain, the game will continue for sim use. I'm not sure what that means, and I would much like some clarification since I'm getting into that world. I realize he cannot reveal Trackman's business plans, but it would be nice to have confirmation that JNPG will continue to be developed, or at least available, for consumer use in that fashion. Personally, I'd really like to know this before I shell out the money for a SkyTrak license for the game (my SkyTrak arrives on Monday!) As I've posted before, I also think support for cheaper sim option than SkyTrak would sort of be a bridge between PC players and sim players.