Well you have to accept that the majority of the current fallout fanbase started with Fallout 3.
The original fallout fans are actually a minority.
Bethesda/Obsidian are a business after all, and must cater to the majority rather than the minority.
In the future Fallouts, you can expect a more Fallout 3 feel, with exploring and an exciting game world filled with quests and dungeons with a decent story, as opposed to a brilliantly told story with a more static game world.
It's just what gaming has become.
I'm not saying it's bad, either, as I consider myself a Bethesda fan more than an Obsidian fan.
No, i dont, there is no proof of that.
A medium-sized established fanbase is worth more in the long run than a large fanbase that may or may not stick to the franchise.
Minus the "quests" "static" (The originals were far more dynamic than Fallout 3) and you're statement is worded correctly, but it is not right, that all future Fallouts will have a non-Fallout feel, i so do refuse.
If that is true, it is sad, it used to be for gamers by gamers, games for nerds, before the coming of "casual gamers".
I consider myself a Fallout fan.