I am perfectly capable of modulating my character's xp gains without a disabler, but I'm happy that those who want one can get one. it would be nice for Turbine to add a version to expansions in the same way they do for the 495TP per character boosters. What gets forgotten is that the disabler didn't go obsolete with level cap increases, while the boosters do (or did ... looks like the Stone of the Hornburg will scale to 99).
"No sadder words of tongue or pen are the words: 'Might have been'." -- John Greenleaf Whittier
"Do or do not. There is no try." -- Yoda
On planet Earth, there is a try.
Indeed, in a world and life full of change, the only constant is human nature (A is A, after all :P).
We old vets need to keep in mind those who come after us.