No, why not just put it in the home button?If the iPad mini is getting side Touch ID is the main iPad likely to?
Tell me why entry level iPad gets form factor upgrade shortly after iPad Air?I suspect the entry-level iPad will get side Touch ID if the iPad mini is. It makes sense to move the whole product line to full-screen devices.
Differentiators for iPad 2021 models:
iPad Pro - M chip/dual camera/Face ID
iPad Air - latest A series chip/dual camera/side Touch ID
iPad - A12 or A13 chip/single lens camera/side Touch ID
iPad mini - A12 or A13/single lens camera/side Touch ID