I don't see much changing either, the most likely Justices to be replaced (besides Souter) are Stevens and Ginsburg (due to age and health respectively) and neither of them are known to be friends of the Second Amendment.
Smith, and Wesson, and Me. -H. Callahan
Well waddaya know, one buwwet weft! -E. Fudd
All bad precedents begin as justifiable measures. -J. Caesar