Future of Bitcoin Economics depends on mass adoption of Bitcoin. No body can predict accurately the true future of Bitcoin.
We can't predict what could be the future of bitcoin. To earn bitcoin they have many ways to do that trading, mining, investing, gambling and many more. Bitcoin prices is not stable so that prediction did not help to know when is the right time for buying and selling. From the other side for payment we can't predict to use it for other transaction so that no one will know what will be happen for the future of bitcoin.
In my opinion the future of bitcoin is very bright due to as of now only very low percentage of population know and have knowledge about bitcoin. So, bitcoin has a very stable and good future. People use bitcoin where other options fail to meet the needs nowadays. So as far as the people will know about bitcoin they will convert fiat currency into bitcoin.
If you are thinking of mass adoption = to higher demand than you are right. Because mass adoption can really generate a new demand that Bitcoin is yet to experience.
When bitcoin prices are getting doubled, it means the demand got doubled which is very much a new for bitcoin ecosystem like it have not experienced that much big level of demands before. But I do believe this will keep on happening for another hundred years too.