Good post and some good points!
I'm kind of divided on the tires. I've seen good and bad in both vinyl and styrene. The MPC Datsun pickups had styrene tires,and they were horrible. Too tall,too skinny,and hardly any tread detail.
As far as tractors and farm equipment go, I've never built any,but they do look interesting. I can see the point about it being a smaller market for them.
Personally I would like to see some older big truck models,like a 56 Ford F-600 or 60 Chevy dump truck. Talk about a small piece of the model hobby pie...