It is already a power Congress has, Congress just requires a 2/3's vote then the same 3/4's of the states for Ratification. Funny how there is no fear uncertainty and despair about Congress going off the rails with it's similar power.
For the left the process is finding a sympathetic judge then a Court of Supreme Whim ruling and voila! A proxy amendment by 9 black robed lawyers! It has been over 200 years since the Court seized this final ruling power. The COS could finally do something about that.
The Constitution provides for many safeguards and boundaries as well, yet they continue to do whatever they want, and the courts don't stop them. To think, somehow, that they would abide by any guidelines whatsoever is simply laughable. You want a complete end to the 2nd Amendment? This is how you get it.