Let me firstly state that there's nothing more unsubstantiated than this rumor from Digitimes. Yet NVIDIA may quit the mainboard chipset industry entirely just as it's rumored to be expanding into new areas, if a claim from companies producing the final mainboards themselves.
The California-based creator of the nForce line has allegedly held a meeting this week to determine whether it should continue producing chipsets at all but has been met with "silence," hinting both that NVIDIA was already considering an exit but also that weak demand gives it little reason to continue. Some of these partners have already made their intentions clear by canceling mainboards that would use the nForce 7-series chipset, the report argues. The line is NVIDIA's flagship and gives both AMD- and Intel-based computers support for advanced performance features such as quad SLI, which teams up four video cards to accelerate 3D on one display.
SLI's future would be uncertain without a company dedicated to supporting it and would potentially hand a victory to AMD, which already ensures CrossFire support not just on mainboards that support its Athlon and Phenom processors but also certain Intel-based reference designs.
Updated - A response from NVIDIA's Bryan del Rizzo:
NVIDIA to back out of mainboard chipsets?