I would say that about any refresh. This is a ten-year old model, and a refresh means at least two more years of the same.
It’s all tied up with Toyota, the 4Runner/Land Cruiser have to get next generation models before we’ll see a new Lexus SUV.
I think it's more about TNGA than Toyota, specifically. It seems like what happened with the TNGA unibody applications will also happen for SUVs: Everything was fairly outdated, then in a span of two years we got Camry, Avalon, Corolla, Corolla hatch, ES, RX, Highlander, etc.
The BOF lineup is woefully outdated but between 2020 and 2022, we'll have Tundra, Land Cruiser, Sequoia, 4Runner, GX, LX, Tacoma and a few global models I can't think of.
"Hurry up and wait," comes to mind.
P.S. I have heard the next gen 4Runner family could consist of several models - four door, open top, possibly even two door/open top. We will see.