Well it would be nice to see that almost everyone uses the Bitcoin in that year, if this happens we can also use it to pay more shops.
But there will always be people who don't trust or don't trust the Bitcoin and won't use it.
Here you are absolutely right and I am convinced that most of those who do not trust Bitcoin, they simply will not be able to use it, because bitcoin is not counting papers. Even using a bank card is much easier.