I would think that a lot of people would want something in the 50lbs capacity. I don't think a lot of people are too worried about the weight of the mount itself - given the 50lbs capacity, you are bound to be on the lower side anyways.
I think when A-P retired AP900, there was a gap created between 50-60lbs and 110lbs. The AP1200 with its 140lbs capacity found a true and better replacement with the AP1600 and the AP1100 is a class by itself - not quite AP1200, but also much beefier than an AP900. With Mach2, I think A-P filled two gaps - one was the capacity gap created by the retirement of AP900 and the other was the encoder gap as it relates to 10Micron.
In my mind, Mach2 is not a replacement for Mach1, so with the retirement of Mach1, that capacity gap still exists. In all of this, I am discounting the upgraded capacity of Mach1, which came much later - for the most part, people bought a Mach1 thinking the capacity was 50-55lbs, similar to MyT.
So, for me, the next A-P mount should plug the 50lbs capacity gap. At 40lbs, I think it misses the capacity mark ruling out scopes like C11 EdgeHD and a few 5-5.5in refractors.
The challenge with creating a new 50lbs capacity mount is, I am not sure if they retain Mach2 from a production overhead standpoint. I would bet that a lot of people would forego the Mach2 and get the "Mach1.5" or just jump the gun and get AP1100 with encoders. For me, I would think that A-P would be better off with retaining Mach2, let go of the lower capacity market and see if there is a way to reduce the Mach2 price by $1.5K or so - assuming that a lot of the price increase has come from tariffs and the pandemic. If they can go back to the original "advertised/suggested/call it whatever you want" price, then they will kill most of the competition in one fell swoop (in the lower capacity class).