If you have genetic balding, and you have a forehead reduction surgery at a young age, it may be an issue in the future.
A forehead reduction will not have any impact on future facial procedures but proceed cautiously and consult with an experienced hair replacement surgeon because you want to know the possible full extent of male pattern baldness later in life before having this procedure.
Deciding to do a hairline lowering procedure without knowing if you are going to bald and what your balding pattern might be, may not be wise. The reason is: If you started balding significantly, then you MUST chase the balding or you will not look normal. As you are in Los Angles, consider visiting me to discuss this further
Forehead reduction consist of removing a strip of skin below hairline that brings your hairline to a new and lower station. It should not affect other procedures you may have in the future! Of course you need to check it with the doctor who performs other procedures.