Bitcoin can never be a commodity, commodities by definition have some sort of industrial utility, and Bitcoin was created to be digital money. So, you are comparing very different things when you ask about Bitcoin being a future of global economy, because it has nothing to do with definition of Bitcoin.
As for the first part of your question, it's very unlikely that Bitcoin will become "the future of the global economy", the adoption rate is extremely slow, and governments can easily reduce adoption if they will feel threatened by Bitcoin. But this doesn't mean that Bitcoin is losing or that it is useless, millions of people find it useful.
In the aspect that bitcoin would be the 'future', it is a bit sketchy at this moment despite of the adaptations being made by economies of different countries especially those wherein cryptos are being used nowadays. What makes the vision blurry, is the issues being faced by not only bitcoin but also other cryptos with regards to the market price volatility, decentralizations and other matter we know, slowing down the acceptance of such technology. What gives a possibility is the demand of blockchain related skills by many companies nowadays, given that it has a strong relation with Bitcoin, so I doubt it would only end up as something being traded due to lack of stability in its price, which could either be good or bad in some periods just like with other goods in the market.
Digital currencies would more likely be the future but we are lacking assurance that it would be bitcoin that will represent what future would look like, since there are other digital currencies being more widely used by this time. It would mainly depend on how will its futher developments become.