I think you misunderstand. This isn't saying Asus is not going to make any more Intel-chipset-based boards. This is saying that Asus will not be OEM outsourcing motherboards for Intel any more. In other words, Asus built motherboards for Intel and then Intel put their name on them and sold them as Intel-built motherboards.
Get it? Intel-built motherboards are supposed to be the epitomy of stability without any overclocking at all. They have to be made by somebody and even though Intel does make chipsets, they don't actually build motherboards so they outsource to others to do that for them. It was big news when Asus took up the burden in years past because Asus is one of those BIG companies that produces some of the most stable (or so many claim) motherboards ever. So them building Intel motherboards ensured that stability Intel is suppsoed to known for continued.
What this is saying is that Asus wants to charge Intel more than Intel is willing to pay to keep making motherboards for them, so Intel said they could get a better deal elsewhere and they cut their deal. Asus will continue to make its own (and ASRock) motherboards and OEM to a lot of hardware vendors (Dell, Alienware, etc) based on Intel chipsets.
Just no Asus motherboards will be sold as Intel ones after this breakup.