IF FCA would do something like that, they'd need to share the basic platform with Dodge, Chrysler maybe, and Maserati. In many market considerations, Durango is already there, just not with a 3/4 ton version for serious towing.
The large SUV market can be fickle. More people bought Tahoes/Suburbans than really needed them. Last fuel price increase (10 years ago) and they got "cheap" on the used car lots. BUT for the family demographic that really needs something of that size, those used ones were really nice to find! So there's always a core market for them, but it's been eroded somewhat by the "3-row" crossovers, even if that 3rd row can't be inhabited OR accessed by anyone larger than a small teen-aged human. AND can carry any luggage when that 3rd row is inhabited! The "towing market" seems to have been replaced by the "large cab" HD2500 diesel pickups.
Right now, Jeep is in the sweetspot in product and customer desires. Putting a "larger" SUV there might make more sense than for "performance" Dodge or "Luxury" Chrysler. How many remember the Chrysler "Aspen"??? Of course, Chrysler Corp marketing was not at its best during the Daimler/Cerberus era!
To me, the Durango is a "best kept secret" that's not being fully promoted as it could be. Performance with utility with style with good power. Not very many on the roads down here, unlike $35K or $75K+ pickups.
Can't really see Chrysler competing with Escalade. Those "1%" or "1% pretender-leases" would not help corporate profits. Although Chrysler Imperials used to easily challenge and best Cadillacs in many areas, the generations that remember how much better those Imperials were than similar Cadillacs are not really in the market for something of that nature, at the present time, I suspect. Especially with Mercedes, BMW, and Infinity now playing to those same upper-level market demographics! Chrysler would get lost in the dust, unfortunately.
Perhaps the current purchasers of the orig Jeep Waggoneers, having been completely restored/refurbished/rebuilt (by a company in SW TX, for one) might buy a new Jeep Grand _______? BUT it'll have to meet some really "high bars" in many areas to have credibility with them. Not unlike the fwd Chrysler 300M and the original Letter Car owners.
Just some thoughts,
CBODY67