Massive conflation of issues here...
First, the delay in the employer mandate is for a year, and it is simply delaying the fine assessed to companies with more than 50 employees. Since 95% of businesses with more than 50 employees already have health insurance options, this fine and delay impacts only 5% of businesses that would have been subject to either providing insurance or being penalized a specific amount per employee (iirc, about $65 each). The reason for the delay is because those 5% of businesses that don't offer insurance are concentrated in low wage and low profit margin areas, like fast food and cleaning contractors.
The real issue is that health insurance should not be part of employment, period. You'd think that business would have been overjoyed with single payer, and divesting themselves of this burden would have been every business owner's wet dream. That said, the individual mandate is critical to the overall success of the ACA because of the benefits that we're all getting, like no pre-existing conditions and removal of lifetime caps.
To suggest that the employer mandate delay is unconstitutional because of equal protection is a red herring. And since when have Pubbies been worried about equal protection? The entire argument has been rather suspect, and I think most people see it as the contradiction that it is.
Second,saying that Pubbies "just wanted to talk" to Obama about it is like saying they just want to talk about gay marriage. They don't want to talk about it; they want to kill it. And since when do politicians get the opportunity to "talk" about implementation of duly passed laws? Or, should the democrats have said they wanted to delay the Bush tax cuts to "talk" about them? The point is that Pubbies and teatards thought that Obama would cave (just as he did in 2011 and again in 2012) if they held the CR and debt ceiling hostage, and they thought they could extract additional concessions. It was a purely political move.
I'd like to point out once again that Obamacare is controversial and difficult because it is the first step in realigning 20% of our economy. It isn't going to be easy, quick, and painless. There will be winners and losers. Pubbies just want to control who wins and loses, so that they can see that wealthy people win and the rest of us lose.
Back on point, the delay of the employer mandate isn't going to mean the difference between Obamacare working and not. This is an example of one of the tweaks that Congress needs to address, but can't due to Pubbie intransigence. So long as Pubbies and teatards have any power, Congress will not be able to make the adjustments necessary for the ACA to run smoothly. Therefor, it will be a bit rocky to start out, but we will get the problems solved over time. But this is what Pubbies fear, because once it fully kicks in, people are going to like it. And then, Pubbies won't have any wiggle room to tilt the balance towards the wealthy.