I appreciate your fervor for what we both think is right, but we couldn't even pass the gay marriage amendment in the Senate by a majority vote this year, much less the amount required. And all that while the country is overwhelmingly opposed to it. The country will drop its opposition when they figure out the gays have an Article IV slam-dunk case for shoving Massachusetts's shambolic, four-judge court decision down the throats of 280,000,000 Americans.
It's not that clear yet. The states that have approved Defense of Marriage acts have not yet been sued that I know of. Presumably the high court will rule those unconstitutional, but perhaps not. Texas is going a bit further in attempting to insert a state constitutional provision banning gay marriage. That creates a secondary legal hurdle.
It's obviously easier to enact a Constitutional Amendment than convene a Constitutional Convention. The former has been done many times, and the latter attempted many more times, but without any success.