It's been discussed before, but it bears repeating - combat is the core of everything you do in this game. They could add all the amazing content in the world, but without interesting class mechanics it's never going to be fun for people with more than three working brain cells to play. You need a core of fun gameplay loops to build on.
As to your other point, I'm not sure what "creating wars in some other zones" is referring to. If you're talking about pvp I'm going to have to politely remind you that at least in the west no mmo with pvp centric endgame has ever been as successful as the pve ones. There is a subset of players who enjoy that sort of thing, but it's by far the minority.
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This is really apples to oranges though. Yes, loot from raids was more scarce, but that increased its value. It's not like every shlub was running around ironforge with better gear than you, as a raider. In fact just having a few epics meant you were doing pretty damn well in comparison with the rest of the population of the game. (Reminder: only something like 5% of the ENTIRE vanilla wow pop ever even killed a raid boss - we're talking MC here.)