Welcome to the site, Simon! Just the fact that you're here tells me you're getting to the point where you are making up your mind about this, it's a good step. Most of us took some time to reach the decision. You'll reach it the right way, just make sure you don't wait until you have to switch from resurf to another device.
One thing already suggested is to take a copy of your X-rays and send it to some of the surgeons that provide free consultation. This will add good information to what you need to consider; the best thing for you is to get the best advice possible.
As to shavings, I assume you mean the metal ion issues, which are individual metal ions, not large metal shavings. I think those have been talked about extensively here, and while they are a concern, it seems to be tied to making sure the surgeon does a good job of placing the components in the hip correctly. The percentages of bad outcomes are not huge, but you do need to consider them, which is why a good, experienced HR surgeon is important.
As to waiting, I guess the question that I finally asked myself was why? The recuperation period is comparatively short for any surgery (I was independently mobile by 3-4 weeks), and the results after 6-8 weeks are very good, after 6 months it is superlative for me as compared to before. So the question is - why suffer when you don't have to? Your body is taking punishment that it doesn't have to.
Regrets - none. The reverse, as a matter of fact: I am much more optimistic, can sleep through the night after waking up five or six times per night for five years. No more grinding pain, I am already more active athletically than I was on the two years prior to the surgeries. I ended up having my hip dislocating at will as I was walking, sleeping, etc. then having to periodically pop it back in. Don't let it get that far.