When it hits the production limit then I think its denominations will change. So bitcoin could be $100k per coin and the equivilant of a dollar would be like a 0.0001 of a bitcoin or whatever it works out at. So why does it matter if there are no more produced?
Obviously anyone who doesnt beleive in the future of bitcoin will disagree and anyone who wants it to / beleives it will / succeed will think of something like this.
I don't really know any more than the next person. But thats just what I think