Blizzard, god bless them is getting ready to release yet another D2 patch and reset the ladder. But there's never going to be a DII resolution patch from Blizzard. It's a 2-D game, so the only options for supporting higher resolutions are 1) redo the graphics for the entire game, or 2) let the player see far further than the monsters. And it would be very hard to balance that, since suddenly your resolution would translate into an advantage over other players who are still playing old school low rez. The game would be a whole lot easier if you could see them mobs before they could see you. And of course, lots of the people who still play are into dueling, so unbalancing that by basing sight range on resolution would also spark RAGE!
I can't imagine too many people making this request. But lucky for you, none of the bosses in Diablo II seek you out in any way. Each Act boss is in a specific place, way down at the end of a dungeon, so avoiding them once you've killed them the first time (to advance) is the simplest thing in the world, even if you want to otherwise clear the rest of their dungeons out (completely to the last monster, in the case of Diablo, Baal, and Duriel). Just don't fight them again if you don't want to.
