"Warning: You are about to outlevel your story arc!"

I've heard many times of people outlevelling their story arcs for one reason or another, mostly because people spend time teaming which multiples the instanced critters, increases their rank and adds that special XP modifier to increase levelling speeds.

The solution most of you vets will suggest is turning off experience before exiting a level-bracket, I will admit I've only just start doing this practise, especially in praetoria. But the fact is that many, many players won't have the knowledge or restraint to go into the options and turn XP off, nor know what these level brackets are.

So for my suggestion I suggest a new UI element to be added, a prompt called the Story-arc outlevelling prompt

Upon reaching the last level of a bracket, a prompt will appear warning the player that if they level up one more time then the story arc will not be able to be completed. The player is given the option to ignore this prompt or accept it to turn off XP either immediately, or if possible, just before an actual level would trigger. That way an unassuming player will be able to gain as much experience as they can without outlevelling it, and more importantly know when they would outlevel a minor story arc.

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This suggestion probably has zero use for Lv50s as they don't level anymore, but with a prompt telling you that you could outlevel a contact and give you and easy way to halt XP gain for those who don't know how to will help new characters get the most out of City of Heroes, and perhaps even improve the chances of not missing bank missions through outlevelling either.

As for the issue of turning XP back on? I would have to guess either a value-monitor checks whether you have any more contacts of the level bracket, prompting you to turn XP back on. Or maybe have a small button appear on the screen to 'Turn XP on', disappearing once pressed.

Most likely for those who prefer being on the verge of levelling rather than one whole level away. The ability to halt XP at Lv#.9 would encourage players to use the feature as they would keep gaining XP up until the closest point and not just subvert it for min-maxing reasons.

Might be feasibly done as a Pop Help.

This is one of the reasons the devs implemented Ouroboros.