"A full magnetically suspended rotor is the best solution, no more bearings"
This is how a MAG should work, once started.
The bearings are only in place to help with start up noise, after that fluid dynamics takes over..... Well in most cases anyhow
The problem with "fully" magnetic suspension is pumping dynamics, you will need a close to zero turbulence flow, or uniform.....which leaves centrifugal out
With axial flow this maybe possible, as it has been produced with fans.
Of course magnetic material development may someday allow this in pumps as well.
More likely we will see the release of sapphire on sapphire bearings, then possible sapphire or ceramic mini in fluid ball bearings.
I think is both cases the factor them will be chamber design, as water noise will exceed bearing.