Note the 3 tiered problem..

1)The NRA lobbies with lots of $$$ against any changes.
2)Members of Congress who might be willing to DO some changes fear they will be defeated by NRA lobbies, and that they will be unable to pass sane legislation on other issues. IF they are replaced by NRA stooges, their replacements will likely be worse on all issues.
3)IF there were a grassroots effort which actually got some sort of progress made and a few laws thru, the 2nd Amendment challenges would end up in the Supreme Court, where several of THOSE justices are essentially owned by lobbyists for Conservative causes....and if someone actually got the 2nd Amendment revised (requiring 2/3 of Congress), THAT would have to be ratified by 3/4 of the states, which can take years. The "equal rights for women" amendment died when a number of states (guess which ones) never ratified it.

It took YEARS to g-r-a-d-u-a-l-l-y pass laws limiting tobacco sales...and tobacco was proven to be be a danger. I have no idea if the gradual approach is possible with guns.

Because of the history of the country, and a 2nd amendment written in such a way that make it hard to interpret, we have gradually developed a 'culture' that expects firearms to be part of daily life.

Even sane people commonly use & keep guns and adopt the "I'm not the problem" attitude.