Much as they appreciate custom from UK holidaymakers, they can make up losses by having more visitors from other countries within the EU. This has already been the case recently in Spain while UK visitors were prevented from coming due to Covid restrictions. There were a lot more French, German and Dutch visitors during that time.
We were in France from last week in August through September last year.
The Mediterranean was as busy as I've ever seen it. Of course many UK residents will have done as we did but having said that some will have felt the risks too great and not travelled.
Sites that usually take many UK visitors (such as Beaune) were almost empty of UK outfits/motorhomes. We stopped in Beaune to have our covid jabs prior to return to the UK. There was one other UK family there.
Prior to Beaune we were at Cassis where we didn't see any other UK presence over a 6 day stop.
Have to say that with the loss of some (and I emphasise SOME) UK travelers, France will not immediately move into recession. There are quite enough EU citizens to fill any vacant emplacements/apartments etc.
Whilst some who were against Brexit for many reasons, but including freedom of travel, may feel aggrieved at the new hurdles they will now have to jump, surely those who gave their vote to leave the EU will not only have foreseen such constraints but have felt them worth suffering! Obviously there will be a group who expect to have their cake and eat it or, just maybe, maybe are only now realising the new status of the UK and subsequent constraints!
My European trips, and those I'm sure of many others, will not cease as a result of the EU taking back control!
If there are irritations then, for me, any such annoyances will soon be forgotten as I soak up the culture of the EU countries. What a privilege it is to be able to travel, as many do, and enjoy the diversity of culture found on our doorstep. A short wait at arrival or departure is a price worth paying although not one I brought about.