100% support this, they should add some method of quick transport to not only the dwelling but other important areas like Griffin's Hollow and Wigtown.
This isn't without causation, as the travel time enhances the experience and keeps the player from whizzing through quests.
If that is your issue then ok, I can understand that, make it so such a fast travel is only unlocked after doing quest(s). 2ndly that is not an issue because quests can only be done at a certain level, specific to each one. That means that there is already a safegaurd for 99.9% of players over the foreseeable future because there are only so many high lvl pre revelius people.
travel lets the player enjoy the map, see new mobs, and just enjoy the game a bit more.
If you are at the Dwelling you probably own a broom by now. That means that players don't see the map or new mobs, they just see their coords and the coords they want to go to and the sky above and below them. For them the trip to London might as well be an idle minigame that just wastes your time. Also even if you wanted to see everything you could with the broom you are still flying over the same ground over and over, there is not anything new to find once you have already seen it.
Also, from the Dwelling, the player can reach southern areas of the map that might be too high level for them, which in turn might cause them to die.
My best suggestion is to simply ride the train to london and fly to the dwelling from there.
If new players warp to the Dwelling they can always warp back, it is not like it would be one way and even if it was they could just fly/walk to London. More importantly though I think that a example as to why your reasoning doesn't quite work in the server is the train ride to London. You seem to quite like it despite how it goes against all of your reasoning thus far.
The train ride allows you to go across the map, meaning that you can wizz by quests, new players can reach areas they are not supposed to and suffer because of that, and you don't get to enjoy the map/mobs in between. And yet, no one really seems to mind
(including you). If it doesn't seem to be a issue with the train ride I don't see why it would be a issue with the potential Dwelling fast travel.