What's done is done and still think of it as a theory? there's a misconception on the OP of how he understood what bitcoin halving actually does. As explained well by pooya, it's not the total circulation that's being halved but the miners' reward per block. Like if you are earning $12.5 then your profit will be halved and goes like $6.25 and that's the actual rewards the miners get before and after the halving.
Theory. I saw a lot of messages that spoke about this. So far, none of them have been right. 
None of them? how's that?