Gentlemen, it's all about timing, LOL!
Dragon announced an Sd.Kfz.7 Prime Mover in their armor group 18 months before the thing ended up on shelves. In the interim, Trumpeter "ate their lunch" and sold-out most of its run on the same vehicle. Even if DML is planning on extending their C/D line, Eduard could do it now and soak up any pent-up demand for the G-4 in that scale.
How MUCH demand is hard to say. I don't know how well the C and D variants have sold, do you?
Given that Dragon has made no announcement about the BF-110, it's possible they are not looking to release another kit. Dragon has shown no reluctance to go head-to-head with other manufacturers in the armor arena (Trumpeter and Tasca), but Eduard has come to dominate the 1/32nd scale in several categories (BF-109). Dragon currently only has a few kits in that scale, so are we sure they intend to be players at that size? Trumpeter clearly sees itself as a 1/32nd source, though interestingly their BF-109 E is nowhere to be seen. Did they blink, given the current economy?
Eduard's 1/48th G-4 could be up-sized to 1/32nd without major redesign, so I will continue to stick with my assertion they are missing an opportunity to "steal a march" on DML. But what do I know?