Well, according to leaked Blizzard product slates, there will be 2 more expansions coming after Cataclysm. With levels going up to 90, and finally up to 100, have you ever wondered how much health you will have?

I used a few estimations here, but its all just for fun anyway!

First off, I was never 60 during my play time in vanilla, so I dont remember exactly how much health the average player had... And I have yet to see someone in mid to late end game gear in Cata, as no one has such yet :)

I compensated for the 5 level increase in Cata (instead of the usual 10) by assuming we still moved up as usual, and the max level was instead 110 (as the health jump from 80-85 I would think would be much greater, relatively, than from 90-95, as 95 is not a max level).

Level: Max Health:
60 3000?
70 11000
80 36000
90(85) 120000?
100(90) ?
110(100) X

Using excel to plot this, it seemed to create a very nice graph, with health going up exponentially with each new expansion.

An exponential fit gave me the following equation:
1.9846*e^(0.1225x)

Replacing x for level 100, we see this player with about 1.4 million health!!

Of course this doesnt take into account different classes, or tanks, or specs and such...