If it's going to be a stable coin then it's not something you want to buy as an investment, just something to use. As a speculator you will want to stick with bitcoin instead then change to globalcoin when you want to buy something
I totally agree with you. There's no point holding these coins for future growth. It will be a coin similar to Tether (USDT), which will be useful for fixing your profits. I think that Facebook will probably use this coin as payments among its users. The audience of this social network is huge and if Facebook establishes even a minimum Commission for these internal payments, it will receive huge profits from user transactions.