Why not have the bearings in the forks themselves with through-axles?
Interesting idea but the front axle (whether is be a 15mm through-axle or a 9mm QR axle) does not rotate, the hub-body and by extension the rest of the wheel rotates about the axel via the bearings. Making such a system where the axel does rotate (e.g. unicycle fork) would require creating a capture system (which is the current function of the QR) to secure the wheel to the fork that would likely be less user-friendly that the quick-release based systems we have come to expect.