It not just the action of the French. The overall climate of uncertainty. No one should be surprised if things don't go their way in these 2 years. Once infection suddenly spikes, no govt is going to give grace periods to act.
Yes, fully take on board what you are saying. However not everyone going is a holidaymaker. We have booked a ferry late March as we have not been to our holiday home for two years and have a lot of stuff to sort out, legal, Portuguese bureaucracy, quite apart from what state the place is in, damp, things not operational through lack of use. Certainly our gas has been cut off due to zero bills for such a long period.
We have had to bite the bullet and book and hope against hope that things improve. Fortunately we have booked via Bilbao so will avoid France, just hope the Spanish don't impose a ban by then.
Believe me if it wasn't absolutely necessary for us to go we wouldn't be.
N.B. We are going by car so that we can bring all our personal stuff back (including my bike!!) so that we can put the place on the market, a decision based more on Brexit than Covid.