There is a distinction though between amending it to say "people can't own guns" and amending it to just take out the 2nd Amendment. The first would actually be taking away the right, whereas the second would just be removing the protection of the right and they would still have to pass laws to actually take it away.
As for the second point, I actually kind of disagree (putting aside the fact that I don't really care "what the Founders intended")*. I think the only sensible reading of the second amendment is that individuals have the right to own weapons such as would allow them to form a meaningful combat unit. "the right of the people to keep and bear arms shall not be infringed" to me pretty clearly means that people have the right to own weapons, and any other reading requires rather extreme logical gymnastics, and then the justification part, "A well regulated militia being necessary to the security of a free state" pretty explicitly shows we're talking about military defense. Put those two together and the people must be given the right to possess such weapons as would be useful in military actions, and a formation of dudes with flintlocks would be less than useless in modern combat.
*I want to clarify what I said here: I don't care what the founders' specific intentions were, but I do care what they were generally trying to get at. My approach to constitutional interpretation is to try and determine the underlying idea they were trying to get at and apply that to modern situations without worrying about what they might have thought about the specific situation. Another example would be the equal protection clause, which was passed immediately following the civil war and they were obviously thinking about race at the time, but the idea they were putting into it is that everyone should be treated equally under the law, so even though they may not have been thinking about or applied it to women or Jews or LGBT or whatever we should still interpret it so that it does apply in those instances as well.