The big question is will they run macOS or will they essentially be iPad-pro books, my guess is the latter, it's not what I'd want but Apple could gain a lot more in terms of control and revenue that way.
I think it's perfectly valid to be skeptical of the long term plans of any company.
In this case, it seems pretty obvious that they would eventually try to converge the iPad and Macbook, especially if they're running pretty much the same hardware.
I do think it would be a very long transition though.
This doesn't mean that the Mac and the iPad cannot share more technology and both benefit both from that. But with the new magic keyboard available, the one big reason for owning a macbook are the differences between iPadOS and macOS.