Its not just the UK.
Portugal, long seen as a lenient place to follow tracks and trails, has now turned lots of areas in National Parks and made it an offence to drive without a permit.
We are not fashionable, 4x4's are seen as eco-unfriendly and damaging, green laning in UK is heading same way as the dinosaurs.
I think the 'van life' and 'stealth camping' fashion has done us no favours, car parks full of 'wild campers'.......
I suspect we will be pushed further from the centre, with destinations needing to be the further EU countries ie Balkans, but with some countries tarmaccing at a great pace, even countries like Mongolia can now be reached entirely on tarmac dual carriageways.
I was RoW rep for a large land-rover club, did lots with the council, but I quit as so many members saw green lanes as free off-road sites.
I live in Somerset, where all byways are closed to vehicles, being reduced en-masse to restricted byways.