That speculation is a good one
However, what you 've written down is not very likely. Take a look at Fallout 3. Bethesda put soooooooooooooooooooooo much money into the advertisemant and overhyping of the game that people are buying it like candy. They have changed the face of Fallout, and sadly, 3 became the current standard. Most of their buyers do not even know Fallout 1 and 2. Take a look at youtube and the "zomfg" kids" For them, and they constitute most of Fallout 3's audience this is the Fallout.
They don't know about gamesas, let alone Black Isle Studios, and frankly, they don't care. In fact, the game is so popular that gamesas's best bet is to create their mmo in a similar style...so they can heavily rely on Fallout 3's success and its fans...... In a world of money, sales are everything, so if you want to speculate, do ir from a business perspective.
What I have written down is my personal opinion, and I can only hope that I will be proven wrong. ISOMETRIC view Chris ISOMETRIC !!! Ya hear ?