Mashing Headmasters, Masterforce & Victory sounds neat but the reailty is that all three have slightly different animation styles and it be hard to believe they are the same series, but in reailty, I seriously doult Hasbro would bother to dub them over, well, at least Headmasters as its a direct contuination of G1, they might decide to use Masterforce & Victory as a filler line of sorts, given the smaller scale casts, but how offen do we see the actual shows from yester year get bought back to mainstream TV in a big way, not offen I bet and it would be a slippery slope for them because then they'll have fans asking for offical dubs of the anime Beast Wars series (2 & Neo) besides, these things cost money and I doult Hasbro would want to spend serious amounts of money on a show that not got a toyline running along side it!
Hasbro is not going to spend the resources to use 30+ year old cartoons as a foundation for their current initiatives. I still remember Gundam's momentum going off the rails when Bandai, in their infinite wisdom, thought a dub of 1979's original series was a valid next step after the success of Wing.
Even then, as you can see with Headmasters, there are some significant cultural discrepancies at play in how Transformers is done, even to this day.
Headmasters is a "safe choice", until you remember most of the G1 cast have aged out or died. Plus, most are LA-based, which means they cost a good bit more than Canadian or New York dubbing options. Masterforce is just WAY too odd to play as Transformers series here to begin with.
I HAVE been a fan of "selective episode dubs", especially for stuff like the HasLabs Victory Saber and Deathsaurus. Instead of the full series, select a handful of episodes (introduction and key event episodes) and dub those as a marketing support for the HasLabs. Especially at the moment with the Victory Saber shipping, Deathsaurus's HasLab, the release of Galaxy Shuttle, and the probable plan for a Dinoking (and Power of the Primes Battletrap combiner seems like a solid prototype for the Landcross members).
It would also work as part of a "Tales of the Transformers Legacy" where Hasbro could highlight legacy episodes (or maybe even create a few shorter episodes) to explain some of the more obscure characters in the Generations line.