Nearly every fan of the original Fallouts would have liked it if they made Van Buren. But, that's not happening, a fact people have come to accept. The closest thing we'll ever be getting to it is New Vegas and it's DLCs. Obsidian, if they ever make more Fallout games for Bethesda, will likely want to try new ideas and new settings, so New Vegas is truly the closest we're going to get.
That said, last I checked there is a Fallout 2 mod in development that is trying to re-create as much of Van Buren as possible. Might want to keep an eye on that.