Regardless, re: how many Vulcans are left...
some 10,000. There are no colonies.
Old Spock: "I have already located a planet suitable for us to settle as a colony."
Makes sense. I think Enterprise said or implied that the Vulcans were content to just be minor explorers.
edit: Also having watched it again this afternoon, with time to pause and reflect...I'm more than prepared to upgrade the film from really really good to...'fantastic'.