346 would be a hit. I know they follow this thread so after 30 years in the business here's a few thoughts on the subject. This could get long. Lol
Considering how many parts they have for the 346 chassis, they're more than halfway there. But they need to accurately do the 44.3mm 346NE top end. Same with the 46mm top end for the 357. Both of those are quad port cylinders similar to the 372. The 353 and 359 top ends don't perform as well and will not get anyone excited. The 357 was always a bit underrated, and was closer to the 262 than most people give it credit for. But since the folks at farmertec are going back into the 200 series Huskys, the biggest surefire hit, in addition to the 346, would be to do the 262xp. It would easily sell well enough, that they'd be offering it in all of their color schemes. I've already got 4 of them, but I'd need a blue one to match my truck, right?
I understand the business case for the larger saws. In addition to being popular, the price advantage FT can offer over the big CC saws is always greater than on the smaller saws. But serious saw users don't just run the larger saws. There is a market for high performance pro saws in the 50 and 60 CC sizes as we are discussing. I see there is a Holtzforma version of the Husky 450. Not to sure how well that will go over. But I don't think they should have bothered with that model. Supporting that chassis with parts makes sense, as it does with the 51 and 55 models. But it's harder to make the case for selling complete saws in that segment.
I see that Neotec is doing a version of the Husky 543xp. It's a decent saw design, but never came close to capturing the excitement of the 15,500 rpm 242xp. That model was legendary with arborists in its day. You have to run one to get it. Even the milder 246 will eat up a 543. But I still think a faithfully done 346 would be the better small saw success for Farmertec. And they should really consider the 262xp!
242 and 357 would be the next options.
Much of this assumes they want to continue to expand their model offerings. I don't expect that they will be able to do this with the newer autotune and mtronic saws.
Sorry if I tend to get long winded with these posts.