It's called milking margin. R&D and "freshening" dilute profits. The current RAM has been a cash cow for FCA so until the market dictates that they offer something else, (they lose sales in other words), don't expect any paradigm design or engineering changes.
I understand the whole (if you put more money into R/D your profit margin is less assuming you are not selling more vehicles.) Though to basically say "hey, they aren't losing sales so they do not need to (or at least they have not felt the need to) put more money into R/D and bring new features or benefits to this truck does not make sense to me. Ford has by far the largest hold on the truck market. Way bigger than Ram and yet they are still one of the most innovative and trying to bring new updates to their trucks. Maybe that is why they sell the most? (or at least a contributing factor)
Auto industry sets all-time sales record in 2015
"Topping the sales charts in 2015 was Ford’s F-Series with 780,354 sold. That made it America’s best-selling pickup for 39 consecutive years and the best-selling vehicle for 34 straight years." Clearly they are doing something right. I think the idea of trying to constantly improve your product is what keeps you on top (with anything... sports, technology, etc.)
Did the market dictate that Ford produce an all aluminum body? I mean, no one else has done anything like this at all (and they did it for weight saving= fuel economy) So what is the push? Fuel economy? Ok. Ford was the first to offer a turbo V6 in a truck (to my knowledge in ***recent years***). They get V8 power and V6 fuel economy. Did the market dictate that? Maybe? My point is that Ford seems to come out with this stuff before others and then other manufacturers hop on board.
I think part of what Ford does is understand (to some level) what the market wants (and even things the market does not know they want because it does not exist yet... I.E. the ecoboost V6.) and creates that and consumers then say "yea, we like having V8 power with V6 fuel economy".
IMO the Ram has done well primarily because the trucks offer good value (more bang for the buck) and the Hemi motor (among all the manufacturers I like this motor the best. Until Ford comes out with a 5.0 Ecoboost motor).
There is only one other truck I would buy and that is a 2017 Raptor and unfortunately I do not make enough money to buy one right now.