I did perform a brief search and could find anything addressing my suggestion, so, here goes...
The system in place at current strikes me as a little unfair/un-nerving. Either you hit level 50 and stop receiving experience or you hit level 50 and you can't keep track of it anymore. Considering Squeenix intends, at some point, to lift the cap, presumably, it seems a little unfair if Exp DOES just stops dead. You should just be able to pile up Experience for when Cap is finally lifted. That, at least, would be a reason to carry on playing, meaning the functions put in place to keep the pro happy would be bonus functions, like they probably should be.
I propose at level 50 the bar disappears and turns into a number that just keeps climbing until re-cap, then it changes back.
I know a lot of you will feel it is unfair to change it now as some players hit level 50 months ago, my answer is this. This has to happen to make the future game better and fairer for everyone. :)