I think you can apply that to many parts and amendments to the constitution. There are lots of things that we use the constitution to keep or protect that did not exist in 1789. Freedom of speech has limits of course; and we've determined as a society that the right to bear arms does have limits like automatic weapons, bazookas, grenades, mortars etc. I don't think its a jump at all to include other firearms that are clearly very dangerous while still protecting the 2nd amendment.
We seem to have three sets of people IMO. Those who think there should be pretty much zero public ownership of firearms vs those who don't think there shouldn't be any restrictions on firearms and last those like me and I expect the majority of Americans, including firearm owning Americans, who are in the middle and want stricter gun acquisition laws. I think and hope this middle ground group is making its voice heard.