I am not really sure why you think this is a good idea, OP.

If you don't want to play the story and level up, you can buy skips to take you straight to endgame. If you don't consider that a valid investment, your urge to get the endgame isn't an overpowering one, so maybe you'll enjoy journeying through the story. It's a win/win for SE because you either pay a larger amount to bypass the MSQ or you sub for the time it takes to do it. By the time to get to level 80 by either means, you're having fun or you're not. But SE has made money out of you through this time.

If they make story skip free, level boost free and then you decide you're not having fun, they made a month's sub out of you, and that's it. The option to skip the story already exists. Why would they make it free? People who want to rush past the story are probably not going to hang around very long once they've done so, most of the future content is also going to be story based so why would they stay.

SE gave these people the option to buy skips if they want to. That's all the game needs in this respect