I guess a concern (for someone who was prone to be concerned about such things) could be that we become of victim of too much adoption too quicky (Santa?), transactions get all jammy and we're just as quickly disowned.
Yep and that's what all the fuss is about lol I don't think short term its a big issue resulting in that... but will have to be reckoned with one day soon. In deep Bitcoin time then, a scenerio where fees replace block rewards is inevitable. Is that right?

And one day miners will form a a union and demand higher fee's and better retirement packages
