Er, that's precisely what they said about the meeting called to propose changes in the Articles of Confederation. I personally think the Constitution is an improvement, but once the can of worms is opened, EVERYTHING is on the block.
All a Convention can do is PROPOSE changes - they do NOT have a plenopotentiary power to draft and adopt a new Constitution.
I really wish you fear mongers would cut it out with the propaganda because this is the one chance we will have in my lifetime to restore this country to a constitutional republic!
Right now we have a socialist dictator in the Oval Office whose claimed powers are unchecked by Congress or the Supreme Court and this is the Constitutuionally-designed method for WE THE PEOPLE to resolve this problem!
In case you haven't noticed, everything is already on the block.