Hi
Actually, what your revision would be depends on your problems. Some of the people with loose cups were able to get the cups repaired and kept their hip resurfacings. There have been 10 loose cups lately, but all were from less experienced surgeons. A loose cup is basically surgeon error. You can read about that here
http://www.surfacehippy.info/loosecups.phpThe reason the cap part on the femur would loosen would be due to your own bone not continuing to hold the part. Then normally you end up with a revision to a THR. They would try to keep your acetabulum cup and only give you the femur part. That is good reason to walk a lot. Weight bearing exercise builds bone density.
Don't worry so much. You are doing well - don't think about revisions yet. Even if that happened - you still win because you are able to live your life without pain.
When you decide what surgery you want - it should always be your own decision. It is nice to have others support you, but it is your hip and your decision. You made the right decision because you still have your whole femur bone left for a revision later in life if you need it. That alone is enough reason to start with a hip resurfacing.
Who cares whether she thinks she won or lost - it is your hip. I am a wife and I would try to explain what I thought was best for my hubby, but never nag him over his decision. This hip replacment stuff is major surgery and very tramutic as it is, you don't need to be fighting over what was best. You made your decision and as far as 90,000+ of us are concerned that have hip resurfacings, you made the right one.
Take it easy. Walk and have fun.
Pat