What else can the president do?
For starters I share your view in this regard, but I also respect the constitution. If one of the amends is ignored others can be as well. In that case we can soon own "one", eliminate freedom of expression, forget about a speedy trail, etc.
If all states' legislative assemblies are by popular vote then in theory, then as little as 2.48% can decide whether. More realistic with states that will favor a change removed and going further down the list, in which case 3.23% can decide.
Skin the cat any way possible, the second amendment will not change in our life time.