If is truely happen that that new coin of facebook will launch, I think there is a new competitor or I can say that bitcoin has a huge and strong competitor. Because all we know that facebook don't need to advertise if they launched their own coin because they are already popular so people will surely adopt that coin.
If possible, this coin will certainly have a very large market capitalization and will attract many investors around the world to invest in this market. I think this is a prediction that will happen in the near future because Facebook is one of the top 10 largest companies in the world and GlobalCoin coin will be the most suitable opponent to defeat Bitcoin in the near future.