I agree with you on this!!!! ****, I'd be happy with the same 321cc motor, but reconfigured into a cross-plane crank!!! I track a highly modified FZ-07, which makes me smile ear-to-ear inside me helmet EVERY time I ride it. I also ride a 2019 R3 on the street. I LOVE my R3 (which is "barely" street-legal). My R3 helps me make "better choices" on the street. I do however miss the low-end "torque/grunt" of the cross-plane configuration. Unfortunately, I don't see the cross-plane making it's way to the R3. The R3 in it's current configuration is the best selling bike for Yamaha in the USA. Yamaha will most likely NOT change that (until they have to) ...I borrowed a Yamaha Camp School MT-07 for a few sessions on VIR-North. Bike was stock aside from Q3+ tires and Woodcraft clip-on conversion. It was far more fun than the MT-09 on the track (rode one the same day) and reminded me of the R3 but with enough extra punch to amp up the excitement. Like the R3, MT-07 was flickable without instability (unlike MT-09) yet still required efficient riding to maintain a high pace while the suspension was a wallowing underdamped mess. Fortunately, the extra HP meant not being passed as often on straights. Tons of fun! Hopefully, Yamaha allows themselves to take the MT-07 foundation but not cripple it with MT-07 suspension and instead grace it with 08-16 R6 front ends they've amortized ages ago. Makes a more premium bike than the MT-07 and they can charge accordingly, like the Tenere 700. Don't simply slap a fairing on an MT-07 and leave the rest identical. That's lazy and buyers won't justify the sportbike looks for the sportbike insurance rates that'll follow.
As for a R3 roadmap wish list, I think Yamaha should stroke the engine out to nearly 400cc but give it a 270 degree crank. They can then go head-to-head with Kawasaki yet offer something unique with the cross plan crank. A 400cc CP2 engine will be something most people would be willing to pay a premium for above the Ninja 400 price. Hello R4!
BTW: Adding the R6 front end to the current FZ/MT-07 frame has proven to be a poor choice on the track. The forks have proven to be too "rigid", and transfer that load onto the frames' steering head- resulting in some cracked frames in a "race" application. I'd still LOVE to see a R7 though !!!!!!