Suggest you do heavy lurking in multiple opinions from multiple types of docs and especially consult an PCa oncologist? Why? Your info herein does not have enough info to even look at nomograms, Partin tables, narayan tables, bluestein and such tools for finding out if you have any reasonable chance at successful surgery. Some docs might even tell you, I won't do surgery on you...as I had heard by a righteous doc...whom was totally correct on that.(stats were ridiculous).
Did you have your pathology reviewed by one of the few real experts?
7 of 12 positive cores most likely means in your prostate there are more cores that were missed via the small sampling of biopsies, it is possible to have multiple gleason scores going on in your gland (they found 3 different scored types in mine and in two sets of these 3 types), so you don't know for a fact the exact nature of the beast...this is how it is in PCa. This is why alot of patients are under assessed and not properly staged or evaluated and add to it the crapshoot factors and so patients are kind of sold a bill of goods. The nomograms are an averages thing and cannot be held to total accuracy anyway, but is a better tool than nothing.
If one is a higher risk patient, sure you can still have surgery from somebody, but you might be looking into salvage radiation or other salvage treatments and/or drugs/hormone therapies after that and you could end up doing all of these. So, how prepared are you for the next step(s), because it could easily be more than a one step process! Not even knowing your stats well enough, would guess that you are in the somewhat higher risk category, have you tried looking into nomograms?????
Anyway hope you find successful avenues, like usual let us know how the robotic surgery went after you are done. Not meant to scare you but encite you to learn and know what your risks are and the ramifications of your future decision(s).
Read the book 'A Primer on Prostate Cancer'- Dr. Stephen Strum (asap)