The US do seem wedded to their guns. Some suggest as many as 300 million guns in the hands of private citizens - in a country of some 320 million odd.
Given this prevalence of guns, given the reverence with which many americans hold the constitution, and given that this right to bear arms is enshrined in the constitution, it is very difficult to see any major changes in the forseeable future. Indeed, some states are liberalising the laws still further- reducing the number of background checks, reducing the cooldown time, allowing concealed weapons in public places etc.
There is something odd though about the americans attitude towards guns - Canada has very nearly as many guns per head of the population as the US, but a significantly lower rate of gun-related violence and spree killings.
I would have thought that banning automatic assault weapons might be a fairly uncontroversial first step, followed by limitations on the magazine size. This might have some impact on these horrible spree killings we see every few years or so over there.