Might never go back to $30.
And you might get hit by a meteor while you're laying on the ground convulsing after getting hit by a lightning while you were celebrating winning the lottery.
There's nothing wrong with gw4tt's answer. Sorry if you're not satisfied by his answer, but his answer is 100% correct ...
You're asking for "the earliest, the latest, the average, and the best guess date when it says Bitcoin will reach 30 bucks again right now" ?
earliest guess date: today, in a few hours
latest guess date: unfortunately, never
average guess date: some time in the future
best guess date: /
Yes, I'm trolling around. But my point is: How should anyone in here be able to predict the future ? You just can't do that.
If you want the $/BTC ratio to reach 30, I can tell you how to do that. Just deposit $100,000 in a trading market with a very low volume and buy all offered Bitcoins up to 30 $/BTC. Et voilà ... job done.
where will drop back to at list 10 because a lot of people will not trust will stay there and everybody will like to to Cash out... untill BTC will be less speculation and more Currency there is no way will go back to high price in short term