Aside from the fact that your car is lowered, it appears you have wide wheels and tires as well. These mods result in suspension geometry changes that will cause added stress to your whole suspension system and not just the axles. Normally a dealer will tell you that, if they see any abnormal wear and/or they see non-factory approved modifications are done to your car. However, subsequent damage can vary depending on the aggressiveness of your mods and the overall design of the suspension.
Since you probably cannot tell if the dealer is just trying to scare you or not, I'd suggest going to an independent shop that specialize on doing "go-fast" mods similar to your car and get their opinion. Based on their experience they can give you an idea on what your car can take. Some cars are more forgiving than others. Also, they may be able to recommend heavier duty parts (if any are available) which may address your concern.
If you are worried about something breaking, obviously you can put it back to stock and hope it's not too late.