In the first 3.5 games (and one play) of 2022, Williams had 63 touches (47 carries, 16 recpts) for 280 total yards.
That is a per game average of 18 touches and 80 total yards, which extrapolates to
306 touches (228 carries, 78 recpts) for 1,360 total yards over a full 17-game season.
The Williams / Gordon touch ratio (recpts, not targets) was exactly 55/45 after the first three full games (52/42). However, as
@ZWK mentions above, the drastically different start to game 4 (11:1 Williams:Gordon) made it clear that the 55/45 ratio was history, and that Williams had taken over the backfield.
Therefore it is reasonable to assume Javonte's per game averages would have only gone up for the remainder of 2022, resulting in a reasonably estimated increase of 150-200 total yards from his extrapolated 3.5 game averages.
If Javonte was on pace for 1,360 total yards, with 3 out of 3.5 games split 55/45, in a putrid offense, with a decimated O-line,
it is not a stretch in the least to assume that in full health he is capable of 1,500 total yards in a Sean Payton offense with a PFF Top 11-ranked O-line, and a backfield split as much as 60/40 with Perine.
Of course, whether he actually attains full health in 2023 and what his actual usage will be (i.e. pitch count, start on IR, etc) are all valid reasons to discount off the top line. Everyone's mileage will vary on that front.
But Williams' 2022 numbers prove that a 1,500 total yard ceiling / potential over a fully healthy 17-game season is not nearly as unrealistic as many believe. In fact, it is quite reasonable.