Certainly firing Vanna during her tenure would have automatically engendered a lot of pushback.
But with any change comes opportunity.
IMO it is obvious that the show will be EVALUATING whether or not to fill the role and if so, how.
Some established supermodel at high price? Some relative unknown as a long term hire who could potentially grow into another Vanna? Or a string of eye candy on short contracts to keep prices low?
Or just finish the automation that they have been moving towards for a couple decades now?
Lots of options.
It's funny how a few posters cannot imagine change...