Let's face it. The future of the world's healthcare will be mostly run by robots. Your surgeries will be robotic. Maybe even nurses and doctors could be partially replaced with robots. Already today, biomedical engineering exists in MRIs and CAT scans and medical devices and genetic engineering and prosthetics. Right now, the field looks like this:

The large field of biomedical engineering includes the smaller fields of genetic engineering, tissue engineering, prosthetics, medical imaging, bioinformatics and many other fields, especially medical-related engineerings. This field has so much potential, and I think the world will forever change once new discoveries are made. Even now, potentially revolutionary research is being performed, like growing body organs in labs. Surgery could be perfected with robots, in which some are already used today, like the da Vinci machines. Here is a photo:

Maybe a few decades from now, our lifespans will be over 150! This field could have so many practical implications, and we can only wait to see what the workers in the field can do.