I certainly would, but only because 10 man raiding exists in a difficult capacity. Aside from that it's not all the entertaining because while I love the revamped 1-60 zones when it was initially released (which caused me to actually level more characters), it will be a feature that certainly wouldn't hold as much weight the second time around. The cool thing about the revamped zones to me was the pacing, some of the storylines, how much faster it was to level, and obviously how it moved Azeroth forward. I realize some people hated that the old world went away, but I didn't, at least at the time. Blizzard obviously did this because they realized one of the big barrier to entry for engagement in the game was that to play with your friends at this point, you would have to level through four expansions of content, otherwise have your friends level with you.
Personally I disagree with some assessments that Cataclysm made classes play bad. I think you can make the case that WoTLK, Cata, MoP and WoD probably had some of the best designed versions of classes in the game. All of that depends on what class you played during which era and the playstyles unique to them. WoD blood DK was still my favorite iteration of blood DK, simply because it was fun keeping BoS up the entire time. MoP was incredibly fun for snapshotting classes (warlocks, mages, feral druids and UH DKS), but I wasn't a giant fan of spamming sit and using defensives as an offensive CD to cheese vengeance at the time.
Again, I'd play Cataclysm but I think at a certain point they should think about possibly releasing these with a new coat of paint. SoM in Classic is actually fundamentally a really good idea, but it launched immediately after Classic had just concluded and didn't really go far enough IMO. Cataclysm had a great host of dungeons to pull from, and while M+ wasn't native to this expansion, it wouldn't necessarily be a bad idea.
If I had to choose I'd still rather do Vanilla over again, but with massive changes this time. I'd rather Vanilla have 25 man raids, with SoM ideas and a fresh coat of paint when it comes to balance. Running the same old class meta is pretty boring IMO.