FFXIV was never meant to replace XI in complexity. In fact, XIV was rehashed as a game for casuals. They left XI running for the people who want complex characters, trials, job system, content. I actually like this division of the games. It allows for a choice.

If you want complex, go play XI.
If you want simple, go play XIV.

By forcing both to be one or the other not only defeats the purpose of keeping both live, but isolates the portion of the player base that prefers the opposite.