I agree with you on that, however you have to consider all the other components to the vehicle that would need to be upgraded, fuel delivery, fuel tank, suspension, power boosting (supercharger or turbo), high volume inter cooler, etc. when you add it all up it comes out to extra weight and less control in a truck. Would be counter productive. This is what the design engineers take into account when designing vehicles. Not to mention the cost associated with each. You could have a very high proformance Offroad vehicle but at what cost, $100k plus. Where would they market it?
One thing I would like to see eventually is an independent rear drive train. Would be interesting Offroad and handle very well.
I really don't think they're going to offer some 700+ horsepower Raptor R. I agree that would have to cost over $100k and there's just not enough of a market for it.
So if they do put the new SD truck motor in the Raptor again, it's going to be exactly what it was last time, just a slight re-tune. I'd guess it will produce no more than 500-510 horsepower and will be a torque monster. In that form, they would probably be able to get away with upgrading fewer driveline components, but there are still some real problems that would need to be overcome. The rear end is getting iffy already and the IWEs are clearly not up to the task. Oh yeah, and the brakes suck.
I'm personally not holding out hope that they will make it, by the way. I was just commenting that an all aluminum NA DOHC 7.0 wouldn't weigh much more than a TT 3.5.
Honestly what I really want is for someone to sell an LS7 swap kit and sort out how to get that motor plugged into the Raptor's electronics. That motor is probably lighter than the EB.
Realistically, though, if I get another new Ford at this point I'd be perfectly happy starting with a Platinum or Lariat 5.0. With aftermarket fenders and suspension (and a Gen 3, 3 liter Whipple) it would be good enough for me.