Changing the constitution for one man, no matter who that man is, is pure foolishness.
Not one man - many, many, many men and women.
There are tens of thousand of naturalized Americans serving in the Armed Forces right now. Why shouldn't one of them be able to aspire to the Presidency some day?
To put it another way: why should Cindy Sheehan be eligible to be President, but not some Second Lieutenant originally from the Ukraine who wins the Silver Star for gallantry under fire?
And, of course, for any foreign-born person to be elected as President, they'd have to be a super-patriot anyways, in order to overcome suspicions about them.
For that matter why should I (foreign born, not yet naturalized, but someday hope to be) be prevented from runnng in, oh 2040 or so?