Just about every MMO has invisible walls, some are higher/more out of the way than others but they're there because they keep players in bound/from walking up 800 feet high mountains and trying to jump up the rest of the way.

They'll no doubt still be around for 2.0 or else you'll be able to walk over gaps in the earth, fly off the map etc lol. Invisible Barriers, however should definitely stay because instead of seeing/walking into nothing before they add a zone, it can just prevent you from entering..they're basically blank transition events.