Wouldn't this be "the" killer store item - and p2w kosher, too?
Account upgrade to convert all stable rides into swift travel?
Isn't hat the essence of convenience? And it provides no combat or other advantage. Other player's game experience is not only unaffected, they even get a little upgrade because there aren't any useless 3D models on rails going through the landscape.
That would be a real bestseller, I'm sure of it. Unless it's pay-per-ride of course.
Turbine already speeds up leveling and gameplay in the low and mid parts of the game, so that people with a job have a chance to reach endgame. This would fit right in.