The 70 Series likely not coming here because most Americans have zero interest in a base "work vehicle" (i.e., stripper model). How many base Bronco/Jeeps/etc do you see running around? Very, very few. Your average suburbanite/mall-crawler who buys a Jeep or Bronco that will never so much as see dirt would walk from a bare-bones 70 Series and only buys the Jeep/Bronco because they look badass and have the modern convenience features of a crossover. Americans want big, expensive, loaded, and bloated vehicles. A few die-hard fans would buy a 70 series, but it's a drop in the buckets. Even if Toyota could bring the 70 here there have no where near the production capacity to actually do it.
Putting our Toyota business hat on....why bother with a true Jeep/Bronco competitor? Their current fleet sells very well, they can't meet production demand.....why sink hundreds of millions into R&D on a model you don't even have the capacity to actually build when they sell 100% of the 4Runners, Tundras, Tacos, and GXs they make and could sell way more if the wanted (2022 sales for all 4 were nearly 500K vehicles - just the 4Runner and GX alone were 150K which were damn close to Jeep/Bronco #s). The last thing you want to do as a business is dilute your core money-maker in order to get into a new market.
Another line is that Toyota should do a better job of increasing producing capacity, fixing chip shortages (7 months of waiting for a 2nd key now for our Highlander....) so they would be able to expand their bandwidth, which I would 100% agree with. Ford/Stellantis/GM have done a much better job in that arena.
Just trying to provide some business context here.