I am likely a Day 1 purchaser of the 16" MBP, and also expect it'll be the "M1X", with a 16gb/512gb base configuration.
Will replace my late-2016 13" MBP which has been my daily work computer for the last year, and still running great, but starting to feel a bit sluggish at times. It's interesting how much my preferences have changed - I was all about portability (hence my current 13") and 6 months ago, was thinking the 14" might be more for me. But now I feel pretty set on getting the 16" assuming the 14/16" announcements are generally in line with what people think.
I realize that this change probably has something to do with me using my laptop in closed-clamshell mode 95% of the time over the past year with what has been a WFH environment for me. So portability just hasn't felt like as big of a benefit as it used to.