This entire post ignores the fact that rumors about Apple’s pricing strategies are almost always wrong.
The base pro iPhone has been rumored to get a US price increased the last five generations in a row, it has not happened.
The Mac line was rumored to get cheaper across-the-board when the Apple Silicon transition happened, and not really. Better value but the actual pricing has mostly stayed consistent.
Given that a 12.9 inch iPad Air is rumored, I think that does point to signs at the price will be going up, but certainly not doubling.
Assuming the 12.9 inch iPad Air takes the old $799 pricing, I could imagine the 11 inch pro goes up to $999, and the 13 inch goes up to $1199, with a doubling of storage across-the-board.
So the air would start at 128 GB, and the pro at 256