Here's the specific amendment proposed from the article:
A referee may view a replay, if available, at the conclusion of a contest or exhibition stopped immediately due to an injury to an unarmed combatant pursuant to NAC 467.718 in order to determine whether the injury in question was caused by a legal blow or a foul.
(a) If the determination is made that the injury was the result of a legal blow, the injured unarmed combatant shall be determined to have lost the contest via technical knockout.
(b) If the determination is made that the injury was the result of a foul, it must be determined whether the foul was intentional or accidental.
(1) If deemed intentional, the outcome of the contest shall be determined in accord with NAC 467.698; or
(2) If deemed accidental, the outcome of the contest shall be determined in accord with NAC 467.702 or 467.7966.
So had this rule been in place, Johnson technically wouldn't have been TKO'd by Burns. It could've then been either a DQ, No Contest or perhaps gone to the judges. In Varner-Cerrone, if Cerrone's blow that injured Varner was shown to be legal then it could've been a TKO and Cerrone could very well have won the WEC LW Title.
If you want to read the entire document, which has some other interesting proposals and stuff (including about insurance & medical expenses covered for fighters), the article is at the link below (PDF):http://leg.state.nv.us/Register/2009Register/R003-09P.pdf
So as an FYI for those who complain about promotions not covering injured fighters' costs: THEY DO. To at least that certain extent ($50,000 minimum).