Consider your maxed out characters. Now consider all the maxed out characters is the biggest MMO (WoW?), all together.
Now consider all the characters, in all the MMO's, all together, ever made, and ever dreamed of being made.
Now watch this video.
Recommendation...if you start to feel that "impending doom" sensation, take a break. It will still be there when you come back.
https://www.youtube.com/watch?time_continue=48&v=YPenDUY68rM&feature=emb_logo
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"When the space for the numbers runs out", if you get my drift.
Once upon a time....