If Bethesda does FO4, they should take a page from their own greatest game, Daggerfall. Make the game cover at least the North American continent, and maybe South America as well, don't focus so heavily on graphics and voice acting, instead focus on content and storyline.
Personally, I prefer text based dialogue without hammy voice acting, or developers spending their budget on hiring hollywood actors to voice a few lines. In Oblivion for example, I felt that having Sean Bean and Patrick Stewart voice a couple of minor NPCs whom you only interact with a few times at most to not really add anything to the game.
However, I still remember fondly Crassius Curio's lines from Morrowind, and some of the ribald stuff from the Sentinel court in Daggerfall.
So, hint to Bethesda, make FO4 much larger, revert to focusing on story, scale down the graphics a bit so peoples' video cards aren't melting, and no more voice acting PLEASE (except for maybe the central plot cutscenes only), so that yo
u can hire some decent writers.
I disagree. I have bought a gtx 260 simply to enjoy this game with its full graphics on ultra high and full AA and AF and its a sight to behold, breathtaking in fact in many places. Games without voice acting (stalker comes to mind) irratate me as well. I want the full blown visual and audio experience.
Do the above improvements to the storyline etc but keep the gfx and audio as per fallout.
Technology is moving on at a fast pace I can't see any sensible reason not to make use of it!
FO3 what a fantastic game!