Personally, I think that Fallout 4 should be one of Bestheda's & Obsidian's major projects, with two major standalone DLC spinoffs that are remakes of Fallout 1 and Fallout 2. Considering that Bestheda will almost certainly need a brand new engine, milking the most out of it will be very important in order to make money back on it. Hopefully, having Obsidian to continue working with them would allow Obsidian to have input on how the next Bestheda engine is built, leading to more options for both players and developers. Rebuilding the first two games would lend all that much more credence to that.
You do know how big the original games were, right?
Those are going to be some very big DLCs.
Another thing to consider, 'rebuilding' them is going to take time, money, resources and manpower, so they'll have no choice but to charge a lot for them. And with the originals, in their original form retailing at a very reasonable price.......
Do I go for a neutered (because some content would be lost due to current views on video games) version with snazzy graphics, console friendly interface and controls and pay something like five times what the originals retail at?
Or do I get the originals for less than a tenner? The graphics aren't up to date and there are bugs and glitches, but it still has spirit.
I'd go the second option.