<font color=blue><Does Kubota "dominate" sales above 30 gross hp?></font color=blue>
Kubota's market share decreases as horsepower increases, but I'd say they still lead the market (in sales) up to around 50HP.
The logic works, but there are reasons, I think, why this practice isn't done much in the tractor market. Tractor buying decisions are made based on many factors and while Kubota could easily put out another product that would probably be "just as good" as the current Kubota line, the new "brand" would have to be proven to the buyers before it could be successful. Brand loyalty is a big factor, as is brand reputation. How many people here would buy a new "brand X" tractor manufactured by Kubota when they could have a Kubota for only x $ more? Chances are, they wouldn't be able to slice the price enough to make that factor deciding, and convincing green and blue-blooded owners would be a difficult task with a completely new brand without anything but the link to the Kubota reputation.
Launching a "different" subcompact (or any class) tractor under a different line? Maybe. But selling a different colored Grand-L (or any) series tractor? I doubt it. But then again, only Kubota can answer this.
Case-IH is one of the oldest brands in the industry, and they have produced compact tractors in the past. Add that to the success of the Boomer series, and the D/DX series is bound to sell. The hesitation to buy is not as great for those reasons, as it is with a brand completely new or offered from a company not as reputable as a Kubota or John Deere. I personally don't see a different colored Kubota clone being successful in the market, unless it had some substantial advantage over the orange sister. If it were a clone, the only advantage could be in the price or warranty. But my point is, even then, are the Kubota loyalists going to buy it? John Deere? New Holland? Case-IH?