it's already hard to fit a small car to park in the city, i don't understand how people can even think to buy a car that's longer than 4 meters. Roads and houses were built during the baby boom when cars weren't used by everyone, so for example in my area there are 0.8 car parks per family.
Then i see my cousin, living alone, single, no family buying a huge 5,5 meters SUV "because in the next three years i plan to move, bigger space is useful". Could rent a van for 100 euro a day instead of spending 10k euro extra for a monster...
Dunno, in Lithuania and around they are getting bigger, not sure about the western Europe though. But seeing every car brand making bigger versions of each car (Yaris cross, Peugeot 2008, Volkswagen t-cross and many more)makes me think they probably are getting bigger there as well.