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At first, some players will decry "but I can't do what I used to! Ack! I can't solo two +4 bosses anymore?" True - but they'll have fun battling 3 white minions - which is something you can say at level 15, but not at level 35.
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Statesman,
While I completely agree with you, my biggest concern is that making mobs harder in higher lvls will just take that much longer to level. They should be harder, but there shouldn't be less rewards for killing them.
Example
1 even minion @ lvl 10 - 1.5% of xp needed for lvl 11
1 even minion @ lvl 35 - 0.0000000000000243% of xp needed for lvl 36.
I know that the business model of MMORPGs is basically make lower lvls quicker to get the player hooked and higher lvls slower so they're stay hooked longer...but if this curve is obviously increasing exponentially to the point of just being ridiculous, only those who love extremely monotonous 10 hour xp grinds a day are going to make it past lvl 30.