MMMGlobal and associated sites actually registered in 2014. Tracking its growth is difficult but see the graphs I have posted here. It could be inferred that the late 2015 rise in price and popularity of MMMGlobal were similar, so in answer to your question, maybe ~$250 when Global really got going.
Let's wait how this will develop the next few days. If nothing more serious in terms of price decline will happen I think that's it.
Bitcoin will survive it and the impact imo will not be that big as some here predicted.
All that's happened is a quantity of Bitcoin has changed ownership, from scammed to scammers.
It doesn't mean that whoever is behind MMM will immediately cash out into fiat. Why should they?