Again, you still need servers to house the new build of the game, without said lines of code.
So what’s more likely to happen, they buy completely new servers for some players that want a single player experience, or they add a rule in the game the players can checkmark upon creating a character that makes it so they can’t trade with anyone?
I’m not saying I’m against the idea of a single player mode, by all means I’m always for more options. However, realistically speaking, I don’t see it happening.