It might just bounce in lower or even break below it, if starts to drop. Another option is that BCH goes parabolic. If that happens, no one knows what can happen.
I'm not BCH fanboy, but it sure have some better tech then BTC and is way more secured then SegWit2x with already bigger block size. Problem is that miners haven't adapted to BCH, but it is Chinese fork so who knows what might happen.
Feel free to comment and share ideas what will happen during this 2 week before SegWit2x fork will happen.
$700 won't be enough. Keep your eyes at $800.