I've seen a lot of "you don't see brand X out doing activity X" comments. One thing I've noticed in my travels, is that there are certainly regional trends. In some areas, I see more GM trucks, and in some areas I see more Ford trucks, etc.
This thread started off talking about older Tahoes and Suburbans. In the salt belt, most of them are rusted and gone. With each newer generation, the large SUVs seem to be less and less off road targeted. The next generation will finally make the move to independent rear suspension. Previously, I might have thought that was an outrageous move, but given how most of these big new SUVs get used, I think the move makes sense. The big SUVs have gotten so expensive, and loaded with tech, I'm not so sure they will ever be very desirable for off roading, like the old ones are now. In a way, that's kind of sad.
Personally, I just bought a new Sierra. I won't be building it at all. I drove a lifted Canyon for the last 6 years. Though I had some fun wheeling it, there are just not enough off road driving opportunities near me for me to justify a lifted truck. Hiking, canoeing, and mountain biking can get me past so many barriers (gates, laws, etc) that restrict driving access. Heck, I don't even know if I will put all terrain tires on my truck. I'll wait and see if the "eco" tires give me any trouble, but so far they have handled "rough roads" just fine.
Since I bought my Sierra, I've been hanging out a lot on the gm-trucks forum. I've observed a lot of members buying big expensive trucks, fitting them with oversized off road tires, and then taking pictures of them in their driveways. I'm not seeing a lot of off road use in that group. Perhaps it's because the group of buyers that can afford a $62,000 truck, can also afford a killer side-by-side or a trailered Jeep for off road fun.