Hey omaggi,
Well now I can finally post with some experience. I have only been here to ask lots and lots of questions, but now that I have had my surgery, I can tell you how I feel about it.
Like you, I had practically no cartilage in both my hips. For 2 years I have tried just about everything to delay surgery. Now I think it was foolish.
I just had both my hips replaced at the same time 11 days ago. One thing that the dr told me was there was a lot of bone loss also, which does not show on mri as much. As it was, he had to use a screw on the left socket since there was not enough bone left. So waiting ended up costing me that way. There were also a lot of bone spurs that had to be removed. All this meant a much longer surgery (over 4 hrs).
The only restriction that is lifetime according to my hospital is sitting with your legs crossed, which is a bad thing anyhow. The rest comes back slowly. And as we have all learned from balleteach, we must have patience

My dr even is ok with me running again in the future.
After bilateral replacement, I was home in 2 days and recovering wonderfully. I did have a huge setback when the hospital found that the wrong ball was used in the second hip and I had to go back the following week to have it changed. Fortuantly that surgery was much faster and easier.
All that said, at 11 days from surgery #1 and 3 days from #2, I can not believe what I am already doing! With no pain, mostly just some stiffness. I am really looking forward to what I can do again now. And if I had waited much longer, there may not have been enough bone to have this good a result.
Do some research online. You may even need to find a different sugeon. I can highly recommend finding one that can do a minimally invasive procedure. There is a big difference in the skill levels of surgeons for hip replacement and the outcome can be very influenced by that.
Only you can decide what is right for you, but for me, I sure wish I had done this 2 years ago!! Good luck!