As long as your pet is healthy, then this surgery can have a lot of benefits. How can you tell if your pet is "healthy"? At our hospital, we recommend a senior wellness package which includes bloodwork, xrays, thyroid tests and a urinalysis. Often, it also includes an ultrasound of the heart or the abdomen. If there aren't any problems on this type of work-up, then surgery is a strong option.
Good luck. I hope you get this horrible ear problem cleared up.