Well, yes and no. Points have a very powerful effect on a lot of players. I don't doubt that people learn, but many people hold put way too much of an importance on trying to be on top in a particular stat. Even if that stat doesen't mean anything. Look at how many people in T1/T2 go HO and don't even play it in a smart way. Not because they can't play it in a smart way, but because other ways yield more points (but less of an effect on the other team). New players go towards things with action sure, but they also quickly pay attention to things like score, and tend to treat it with a higher degree of priority.
I don't have any doubts that people will value offense and defensive points moreso than style points. Overall that is. While there are still big issues with both of those, it's less than the potential for issues with a style point system imo. This thread is mainly directed at the potential of creating a sect of players who will be in pubs abroad who *will* only go for style. Even though it might be just 2-3 players in a server doing that, it could put a negative effect on the server.
As I said in the beginning though, it does come back down to how the entire system is setup. MA's and low percentage shots may just be a small part of it, with smarter play options giving more and being more valuable. However the fact that MA's and the like do give points will still make people go for them more often regardless I'd think.