It is not that simple though, it is not one line of code. It's a balance between players with and without the dark below. There is debugging and play testing to make sure there are no loop holes in the system. There is an issue of setting up a new match making system in regards to the crucible because of the now smaller player pool. What you are asking for is a bunch of work and a ton of money to be directed at people who are no longer supporting the project. There is never "just one line of code." There are consequences to every action and oppurtunity cost to said actions. Bungie chose to support continually paying customers instead of catering to people who are stagnant in the game. I for one support choosing progress.