Geojeeping could be a major problem for Geocachers as a whole.
I work for one of the Wildlife Trusts and i am looking at placing caches on some of our reserves - i know of some really nice spots that will make perfect caches. However in researching the idea i have already come across some trusts that have problems with vechiles on their land as a result of caching (bearing in mind reserves often contain very rare and fragile habitats and wildlife). These Trusts have now decided to remove any caches they find.
just the add to the problems the cache they had problems with was also buried, meaning big sections of reserve were regulary being dug up and there was no permission sought from the land owner at any time.
If geojeepers stick to tracks where they have legal access then i can't see much of a problem but as soon as they go 'off road' or on non officail routes then they may find that all caches are banned from the land owners property. this could inculde Wildlife trusts, RSPB, Forestry Commision etc etc. As this organisations become more aware of caches on their land and of damage cuased they will also become more active in hunting them down and removing them - possibly even prosecuting people.
Any comprisons to geojeeping in America are in my mind completly irelevent as the situtaions are completely different. a jeep won't cause much damage to a 3000 hectares site, but will cuase considerable damage to a 30 hectares site.
Geocahcers need to be responbile for their actions in the countryside and work with organisations where possible to ensure this great sport continues to grow and be enjoyed by others - or you will caching becomes increasingly difficult.