I don't think Satoshi would be against changing and improving Bitcoin protocol because if you read some of his earlier posts you could see that he was talking about key blinding and group signatures back in August of 2010.
I remember that discussion, but I can't find it from satoshi's posts. Do you have the thread link?
and with more important changes in Bitcoin code I believe that most of the shitcoins would not even exist anymore.
I may just believe that changes must happen on extreme occasions like hash collisions or weaknesses on public key cryptography and not for privacy. A privacy layer would surely be wanted, but the protocol shouldn't be changed if the chain started with that idea. To put it another way, who are we to change the way this thing works 11 years now? Shouldn't consensus change only if it's completely necessary? How can you explain to someone that privacy is necessary and not just another one of the improvement proposals?
I know that Bitcoin should have a better privacy system and I don't like getting exposed by blockchain analysis due to my coins' relativization with illicit activity, but we tend to forget its censorship resistant philosophy. Not to mention that if we changed the protocol on that level, we'd instantly make every wallet out there useless. Again, who are we to take that decision? Surely not the majority.
If that was a poll thread, it's a no from me. I'm in favor of using other cryptocurrencies whose purpose was privacy-oriented from the beginning.