If the USSC can't even be bothered to hear a case of CLEAR conflict between two lower Circuit Courts, what in Blue Flaming Hell makes you think you'll even GET a better chance?
Bush can't get a vote on his high-profile conservative judicial nominees because the Republicans only have a one-vote majority in the U.S. Senate, and it takes 60 votes to break a filibuster. Nor do Republicans have an adequate margin to "go nuclear", i.e., force through a parliamentary ruling that says that judicial confirmation votes can't be filibustered.
There's a good chance the situation will change after 2004, since Republicans are favored to make net gains of at least two or three Senate seats and possible much more (depending on whether Bush wins in a landslide and has long coat-tails). If Republicans pick up enough seats in the Senate, Bush will be able to push through most if not all of his judicial nominations. He'll be able to fill Supreme Court openings with more principled Justices, and his track record so far on lower-court nominations suggests that he will do so. Several USSC Justices, from all portions of the political spectrum, have just been hanging on and can be expected to resign before 2008.
So from an RKBA perspective, the makeup of the Supreme Court is likely to improve (perhaps dramatically improve) over the next 4 or 5 years. It's better to wait for that ideological shift than rush a bad case to them now and get a bad decision.
In the meantime, the Congress is unlikely to pass significant new gun-control legislation. Both houses are controlled by Republicans, so legislation can be bottled up in committees. And even many Democrats are not anxious to get into a scrap over gun control, convinced as they are that it cost them the Presidency in 2000 and other races since then.