I think there can be little doubt that life in Spain is going to change post Brexit.... not entirely Spain's decision / fault ..because it as an EU state member must always take its orders via the various non elected bodies that steer Europe.
No stranger to Spain and with over thirty years experience of travelling in & out I know that Spain was never a stranger to legal "Red" tape & bureaucracy but none of that was ever really a problem prior to Brexit so long as money kept flowing over their border.
Covid /Pandemic & Brexit have not helped the situation for any of us but with such a lack of direction and uncertainty for the future combined with the potential for future evidential income ..Enforcement of legal residency etc..I see a very slippery path on the horizon ...
Attempts to get a degree of clarity from legal professionals & Journalists here in Spain has yielded nothing but silence or denial... add to the mix the lockdown ..inability to travel ..empty bars & restaurants...you begin asking yourself why am I here and just how long can businesses survive ?
I may be very..very wrong but only time will tell if the over inflated price of property in a nation of record repossessions was a sound investment and in the fullness of time a culture of them and us begins to develop...