While I understand his point, I think that it raises a question or two.
Nimoy's portrayal of Spock, in a lot of ways, became the template for every major Vulcan character that's come since.
While there were certainly differences between those characters. But, there always seemed to be an underlying element of Spock in all of them, even though they didn't share his human DNA.
I'm not sure how much you can, logistically, change Spock without losing what the character has brought to the franchise.