These are just my opionions
I think it should be focused into reputation grindings, and they should be shared account wide so you could switch between chracters. Old loremaster is so outdated it needs to be replaced with world quests and the rewards needs to be raid quality or the same items you would get from raiding or pvp gears if you enable war mode.
Reputations are a great way to give people goals to work towards but it should not be a grind. Reputations should be a fun thing to work towards; with different quest styles and objectives that work towards that end goal of Exalted. They should also be something that you need to go out in to the world to do “Winterspring rep requiring something from another snowy biome like Dun Murogh for example”
Profession gears also need to be at raiding level quality and revamped.
You could get the recipies from reputation grinds at vendors.
Raid level gear recipes should only be from raid drops or raid related reputations but I’ll meet you haflway and say some grind reputations can reward some great recipes.
And the housing system should be in this mode, something similar to what WoD had.
The housing needs to follow you each expansion, that is why WoD failed couse i couldnt keep using the fort in the next expansions.
I love the idea of housing, but I think should expand it to be more guild orientated. Guilds were a big part of Classic and an integral part of building a good social framework that kept people playing. Games are more fun with friends!
I also liked the war taaables, but they had the same issue, they did not follow you from expansion to expansion.
This has been tried multiple times and feedback has always been only a small minority like that style of gameplay. Sure, if they want to add something later on, go for it, but lets focus on getting the core game changes in first
I think housing should be zeppelins or the allied flying machine version, this way it could follow you from expansion to expansion, give out several docking spots each expansion.
This would essentially cause the same issues we had with Garrisons, people would stay in their little silo and not interact with one another. WoW was an MMOrpg, not an ARPG. Keeping people in their own little bubbles is a very quick way to kill the MMO feel of the game and make it feel less alive.
Classic + should be singleplayer focused while retail is multiplayer focused.
Retail already has all the framework and tools of a single player game where you can just queue using automated group finding tools for instance content. Look at LFD and Raid Finder.
Classic has always been about the journey and the friends you make along the way. The best thing they can do to keep Classic+ alive, is to propegate a thriving community where guilds matter and create an environment that fosters friendships.