Health pools, Classic->Burning Crusade->Wrath of the Lich King->Cataclysm.
In classic, I've seen some videos on youtube* that have health pools of tanks(using tanks as an example since they are the highest health pools) around 5-6k. maybe 7k although I don't remember seeing that. That was tough stuff to take down. Bosses were hard as god knows what**, Dps wasn't even over 2k(guessing on that, but most likely true). In the end, Classic health pools were scaled quite nicely for the 60 level cap at the time.
In Burning Crusade, Health pools for tanks at the end of 2.4(Sunwell Patch) was roughly 15-20k, From what I hear from friends that have played then... 20k being the really high end T6 geared tanks fully buffed. easy enough, Health pools weren't outrageously huge being that it was 20k Absolute maximum.
In Wrath of the Lich King, Tanks at the beginning of Wrath had 20-30k. Although at the end the Stamina on Gear must of skyrocketed because end of Wrath we were looking at 50-60k unbuffed, buffed I don't even know... because we had buffs in the main raid at the time, ICC, unless you removed it. either way the health in comparison has jumped up to a huge amount from 70-80. The Raids have shown an increase too, It's not just the players health pools go up and the Raids don't. I'm not saying that, Just hear out the rest.
In Cataclysm, I've played almost a month in Cataclysm. Reached cap, Have almost 100k Myself for being as poorly geared as I am. The amount of health our tanks have is Stupidly amazing, I'm talking about 150k+. Everyone who played back in Burning Crusade and come back to the game for Cataclysm will have their jaw drop off of their face. They probably heard about stamina balance in the game to "keep PvP at high levels balanced" or just to keep it so they can copy->paste every stamina number on other gear. Who knows? Anyways, I'm saying that health pools have SKYROCKETED***, Something needs to be done before we reach the 500k Mark...
Note: I know the Damage output of pretty much all classes was also super upped... but It doesn't stop the health pools from growing even further.
Secondary note: It'll take a long time to do my suggestion if it was brought up, I'm not worried about that... I just am suggesting it for a thought not a "FOR SURE THIS IDEA WILL GET IMPLEMENTED!!!" idea
Suggestion: Scale the health pools like back in Classic WoW <Level 1-60> Instead of having 512 stamina(or whatever the number is on T11) have less than before... Look at this...
Health(the short version)
6k max <Classic>
20k max <BC>
60k max <WotLK>
??? max <Cataclysm>*
Who knows what the end Cataclysm raid tank health pools are going to be. probably 300k+ minimum... my suggestion is to stop the growth of the health to an outrageous number...
3-4k <Classic capped 60>
9-10k <BC capped 70>
18-20k <WotLK capped 80>
30-32k <cataclysm capped>
note: With my version of the health pools we can one-shot the tanks at cataclysm levels...
no... That's not how this works, Blizzard scales the health AND the damage to appropriate levels, Even though it would take an ENTIRE expansion pack to implement this change... I'm not pushing towards it just suggesting it as I said before...
I'll edit and add to it as I see fit, Thanks for your time.