I think you will find that the programmers know quite well how it will progress, and you can learn too, it's open source, learn the algorithms. Remember the number of coins per block halves ever 4 years, and the rate of block creation is 10min target, so grab your spreadsheet and work out when 21million coins will be reached.
That's isn't what he meant. Yes, that's how coins will stop being mined. But what will the average block pay in total transaction fees at that time? Will hash power go up/down? Will tx fees be so low, hash drops so far that 51% attacks being too easy to secure the network? Questions like that are open ended.