This time our old friend Mark Gurman is making the prediction - iPadOS 19, although NOT macOS, according to Gurman:
"According to Mark Gurman in the Power On newsletter, Apple’s iPadOS 19 will “focus on productivity, multitasking and app window management — with an eye on the device operating more like a Mac.” It won’t quite be macOS for iPad, but Gurman notes that “the changes will likely go far enough” to please those users who are looking to get more out of the tablet’s software."
I bought my M1 iPad Pro, Pen 2, and Magic Keyboard just for this, yet year after year, disappointment after disappointment. However, just like every other rumor, this gets my heartbeat up and I keep thinking "maybe this time" especially if it would let a M4 iPad Air match most of the features of the m4 MacBook Air.
The only thing that will really take it to the next level is true file management. I don't think iPadOS is set up for it though. It would probably take a total rewrite, and we know that's not happening. I'm happy enough with my Jump Desktop setup so far. It works for what I need anyway.