I'd just like to see the whole Fallout 1 game redone in New Vegas style.
It would serve up inferior results. Politically they cannot match it anymore; they are hamstrung by the market and cultural environment the we are stuck in.
(Also... even if they did a precise 1:1 remake in the new style... it would still be inferior IMO; it's an entirely different style of game that offers an entirely unrelated experience; it's not the Fallout series, it's TES cosmetically redone in the Fallout setting.)
*It would almost be like re-doing the campaign and maps from Warcraft 3 as a World of Warcraft campaign.