Yeah, if you need to do correction every few months I'd put the effort into figuring out how/why the paint is getting marred up so much and try to sort that out. Every time you use abrasives you take off a little more clear and eventually you can't do it any more (or, more likely, you'll precipitate clearcoat failure because you didn't stop soon enough).
I end up sounding like I argue this both ways: yeah, you can do moderate correction many times but no, you can't do it indefinitely. It's a matter of not *over*-doing it. IMO if you're polishing more than once (maybe twice) a year you're headed for trouble and I don't do serious correction even that often.
Nobody can predict how often you can use a given product on a given car because there are just too many variables.
odgaard- Welcome to Autopia!