I don't think we would see full convergence. Apple does a decent job at having classes of devices. What I could see is, the top of the line iPad Pro converging with the Macbook Air. The regular iPad, minis, etc will probably stay with a relatively locked down iPadOS. You want an "entry level" Apple laptop, you get an iPad Pro. But if your work flow requires more, than you go with a Macbook Pro, iMac, or Studio.