I agree 100%. A McCain win will cement RINO’s into Republican core power. It’ll prove that being a moderate reaching out the the left is the way the New Republicans win.
Richard Nixon's wins in 1968 (over the leftist Hubert Humphrey) and in 1972 (over the ultra-leftist George McGovern) did not cement RINOs in control of the Republican Party. Ronald Reagan almost won the Republican nomination in 1976, two years after Nixon resigned. Nixon was the correct choice in both 1968 and 1972, not because of his domestic policies (which were heavily big-government-oriented) but because of his staunch opposition to Soviet aggression.
Similarly, John McCain is the correct choice in 2008 not because of his domestic agenda (which is, at best, a center/left one) but because of his firm stand against radical Islamic aggression.