The problem with your sentiment is that most American buyers aren't looking for a large/full size SUV costing $60,000 - $80,000 primarily for off-road usage plus many of the Sequoias' direct competitors also offer models that provide stellar off road capabilities without sacrificing comfort/utility for daily on road driving situations.
Kinda this yes. IMHO, Toyota/Lexus doesn't have anything to combat the large SUV segment (suburban, Tahoe, Yukon, Expedition, etc.). Really just looking for three things from TMC for said future product: (1) Don't be disposable (see Escalade, Navigator, etc.). (2) Legitimately have interior that is as/more roomy than Tahoe/Yukon. (3). Interior noise at interstate can't sound like driving through a hurricane and front seat comfort and legroom (is it too much to ask for 43-45 inches front leg room with proper telescoping steering wheel) should account for fact that most people in North America are no longer 5'8".
Simple asks. roomy, reliable, comfortable. Hell, change the acoustic glass, paneling and seats/legroom of Sienna to make it as comfortable and quiet as say a Yukon/Tahoe and I'll forget this whole discussion.