a) huge dump and panic caused by traders and community, because despite warnings from analysts BTC crowd is expecting different outcome
b) more balanced reaction, but nonetheless price will decline slightly, I hope for max 15% price drop
You don't know this. Everyone thought that Trump would most likely lose, and it was clear that Hillary would win, weall know the outcome.
What if the ETF passes and BTC goes beyond the moon?
In any case, what if you dump now and BTC grows to $1400 before March 13 and dips to $1200?
It's just a big damn gamble.