This sounds like the perfect way to do it, and I would love to see that implemented in the next game.
That's exactly what we have been suggesting, because it lets have the sandboxes people like, a very very large world, and the devs don't have to fill gaps inbetween places with filler content, they can take their time on individual nodes, like time spent on DLC maps, but there would still be randomly generated terrain for random encounters, and Bethesda could speck the map all over with special encounter locations like cave systems or bunkers or raider bases to please TES fans with combat and explorative dungeon crawling, and having outdoorsman skill would allow people who dont like that to avoid them.
Why should we go back to 1-2 fallout style maps the engine couldn't handle what it can in todays world.
Actually, no they cant, the 1-2 Fallout style maps could cover entire states, Tactics covered several states, the "today's world engine" cant even handle an entire city without scaling it down horrendously.