DirtyHarry46 - 2
They will never try to make an RC of the M1, it is not Yamaha culture and would serve them little and lead them nowhere, not the right engine design nor characteristic for that.
Remember how they came to develop their OWs. The 20 was basically an oversized 250 with two 250 engines put together, even the chassis was designed for corner speed, like most 500 of the time. The changes came with the Cantilever in 1974, shorter wheelbase, the OW 23, it opened the way for K.R chassis.
From day one they were pitted vs factories able to produce engines with better power band or/and more torque than their 4-in-line (3 in-line, square 4), so they had to use more corner speed while retaining the possibility for the bike to be steered on the brakes and gas, as K.R did vs Sheene first time out, after Honda dumped the V3 NS and adopted their V4 it was pretty much the same story.
After K.R, Lawson and Rainey did pretty much the same when it come to technical and development direction, from the time Rainey was out, only 250 styles rider were available to Yamaha, Cadalora and Biaggi in particular, not one of them won a title.
To get a chassis to turn/slide more than Lorenzo's typical 2011/13 chassis, you need a shorter wheel base (same old story OW20/23) and more weight on the front wheel, the actual M1 still has too little (see the sledge hammer thing) although they changed that to improve braking, for good steering control on the rear brake or gas, they still are working at turnability and acceleration.
On top of that, it is impossible to build up the right tyre temperature as fast as the RC does and the difference between the coolest and hottest are larger than what the RC generates, it means that the tyre have to work harder and produces less grip on the front for braking and destroys itself chemically like was the case in the USA. It doesn't turn-in as well either but is more stable than the RC which is what Lorenzo likes most.
I don't think Yamaha are looking for an "RC type" of chassis, but more like a "Rainey type" of chassis with a near-perfect balance, and Rossi can get them there.
My opinion: Since they introduced the V4 in GP500 (0W61-1982), they shouldn't be ashamed to return to it and do a 4 stroke OWF9 or J1, which is the HRC approach with the RC, and it works real well for them. Imagine THIS with a 4 stroke V4