....
It may increase of decrease the price of the coin in the short term (hard to say which one: my knee-jerk reaction was to buy XMR as long as I conveniently can, but apparently the economic majority last night wanted BTC instead).
I don't think they wanted BTC - they wanted out of polo. Probably the don't have or don't want to deal with xmr wallets so they had no choice.
If there was an official easy to use GUI wallet, < 4 GB blockchain, and database, the barrier of withdrawing XMR instead of BTC would've been a lot smaller.