well, i think the permanence of the estrogen control depends on the factors that are causing it to be high(ish).
if you're carrying some extra bodyfat, and you lose that, then you might be fine. same if you are low in D or zinc. they are both important in regulating estrogen metabolism, so if they get caught up, you might not need a long term AI.
if you drink a lot, then you could easily mitigate estrogen by reducing or eliminating that.
the more easy fix would be to introduce an AI, and lower you E2 to a more favorable level. while that might not seem sustainable, if it allows you to exercise more and brings you testosterone to a more reasonable level, then it may very well be...
btw, what's your age, body comp, etc?