I think this shift in word use is natural. Words become popular, and then get overused to the point that using them calls to mind a lot of connotation. To avoid that, speakers looks for a comparable word and start using that instead.

Then, eventually most good words (small enough to be known by the average person) get used up and speakers end up creating new words for the same reason.

Witness 'comment / commenter / commenting', which in the sports world has completely given way to 'commentate / commentator / commentating' to the point that those 'new' words past Google Chrome's built-in spell-checker.