I think not. I think bitcoin supply in the whole world is too low compared to the total amount of fiat present per country and around the world. I can't agree that bitcoins can be the next world currency but it can be the building blocks for the coming world currency. Bitcoins have laid the foundation.
I don't agree with your argument. It is always good to have a currency which is protected against inflation. If you believe that the total supply (21 million) is too low, then we can do a redenomination and split 1 BTC to 1,000 new BTC. Then the total supply would be 21 billion coins.
There is no need to do that. Bitcoin was created to be divisible to the 8th decimal digit (1 satoshi) exactly to be able to address the issue Abikyi is rising.