Wrong on several counts. As others have noted, you won't ever be able to deny access to firearms any more than you can deny access to any other product/substance that is "banned."
But this phrase in particular is wrong on two counts.
First, disarming the populace is not in fact a small price to pay. It is an erosion of freedoms and the ability to defend ones self. This is not in any way a "small" price to pay because it will lead to murder on a large scale. (google the 50+ million people killed in the 20th century - by their own governments after having been disarmed by those self-same governments)
Second, it will not avert murder. In fact so-called gun-control will increase violent crime. This is born out by both common sense and actual data collected from places (from cities to states to entire countries) that have tried it. After disarming the victim pool violent crime rates - including murder - increase and remain higher. Duh! Workplace safety for criminals...
A worthwhile reference, no need to Google, it belongs on this thread:
20TH CENTURY DEMOCIDE
http://www.hawaii.edu/powerkills/20TH.HTM