Because your visa validation is 5 years , means at the end of the 5 years the visa is expired. Means also, need a new Visa
Second.... no one ever can predict 5 years time about the policies and the rules to be implemented that time... in reality you can't even predict what will be the situation end of this year.
So.. enjoy your current time holding this visa
Till further notice by authorities and don't bother yourself with that far ending point.