For those afflicted with a kind of "pseudo-ADD", that might be true.* "People get bored" is kind of an issue in and of itself, and probably warrants an entirely different discussion, but this is not the place for that...
* But yeah, otherwise,
not at all.
And it really doesn't have anything to do with not trying other game systems. There are
thousands and thousands of game systems already, to admirably enable/support/encourage just about every possible style of play imaginable.
And considering even
one RPG offers infinitely varying play, one wonders... but anyway, like I said, probably not the place.