I do not think that bitcoin will be enough if the whole people around the world will going to buy bitcoins. There will be too much shortage on bitcoin supply and this will lead also to have an expensive market price for bitcoin. As we all know that there are billions of people around the world and bitcoin supply is only limited. So meaning to say in the near future there will be a shortage for bitcoin supply and thus will lead to create another dominant coin like having ether as one of the possibilities that it will be the next to bitcoin. As of this moment i am seeing this already closely to happen. What do you think?
That would indeed not create any kind of bitcoin shortage 
Instead the price fir bitcoins will surely blow up and will reach some new heights. There are about 21M bitcoins in circulation and the price for them depends on the demand and supply factor. The price will always keep on rising as the demand for bitcoins will rise so we all should hope a better demand ahead as you mentioned and it would surely get us huge profits for holding bitcoins.