Obama has already extended it in an attempt to minimize its impact. Think about what the effect is if the dems vote against a further delay before the 2014 elections. More sinkage.
Repeal is impossible while Obama is president, so best to suck out as much juice as possible in the current mess democrats created.
I know he has delayed, but as Dick Morris recently outlined, that does not help in a lot of the states that are competitive, because these states never signed on to the first optional round of delays for insurance companies to keep substandard plans. These states include Alaska, Arkansas, Colorado, West Virginia, Minnesota, Oregon, and Virginia. The state insurance commissioners have already rejected the delays.