I wonder if this is a bullish sign for Monero. 
https://www.reddit.com/r/Bitcoin/comments/9ceb5v/1b_bitcoins_on_the_move_owner_transfers_100m_to/
https://www.reddit.com/r/Bitcoin/comments/9bfnff/near_1b_are_currently_on_the_move_from_a_silkroad/
https://www.reddit.com/r/Bitcoin/comments/9ceb5v/1b_bitcoins_on_the_move_owner_transfers_100m_to/
https://www.reddit.com/r/Bitcoin/comments/9bfnff/near_1b_are_currently_on_the_move_from_a_silkroad/
The possibility exists that 1 billion in bitcoin could black-swan dive into Monero tomorrow. It doesn't matter, however, it's bullish for Monero regardless.
I can't imagine being someone sitting on a pile of silk road bitcoins. That would terrify me. Anyone with any sense would be moving that into monero while they can still transfer them to an exchange at all.