As long as they're not losing, that has to be a good thing, I think.
Mazda doesn't have to be huge to be successful. I for one don't want to see them try to overtake Toyota; I still remember the 80's and 90's as their cars were boring and uninspired.
Mazda has carved a niche for itself here as the only Asian non-luxury sporty-car marque, and for that reason alone I think they'll be fine.