The use and loss of personal power.

[zifnab]

So would it be accurate to say that eventually, all the Ainur would be depleted of their personal power? Their power dispersed among the world and left in the keeping of men?

It does seem accurate to me, unless they is a way for them to replenish their power, which doesn't seem correct. I assume Eru would have to do that?

It also seems that the examples of the Ainur using their power were early on. The first two ages, it seems is when they proformed the more powerful acts. From the Ainulindale to the Downfall of Numenor(and the "rounding" of Arda, and creation and destruction of other lands). And since their biggest tasks,threats and/or enemies is now taken care of (Forming/Shaping of Arda, Melkor/Sauron), their use of power probably won't be used as often or as powerful.

What have they done since to reval the above uses of power? Probably smaller and simply tasks. It seems that their biggest purpose now is in their abeting the other races.

Granted it does seem likely that when their power is "used-up"(if that is the case), then it might be in the keeping of Man. But I think they will maintain they power till the end of the world.