@Susan17
re. "It's only a matter of time..."
A few weeks ago I posted that I no longer have Thumbs Up / Down option. It's been replaced by 'Would you host X again', Yes / No. -- In other words, a public endorsement mutated into a personal decision.
At the time this change had not been rolled out universally, as others responded still had Thumbs Up / Down.
Yet, in your prospective scenario, while Hosts won't be able to review Guests; do you imply that Guests will still be able to Review Hosts?
If so, I would only add that in my perusal of Reviews from both parties on mine and others listings, it seems far more common of Guest reviews to contain 'petty, nit picky' comments 'for the silliest of things'. -- This is evidently in large part due to the home work & exam like questions Airbnb sets for Guests in Review, that encourages them to be virtual house inspectors. A significant number of Guests seem to take to the task with relish.
Otherwise, I would only reiterate that following the saturation of the London market;
the vast majority of my guests are no longer those 'on holiday to chill'.