Nvidia has to get really efficient at this level or they're just going to lose all that new entry/low-end computer and laptops business. Intel will have decent graphic's in most all next generation offerings, if Nvidia can't provide solutions to OEMs and boutique builders they might not even be asked to show.
To be honest, that's already the case with the market now. Most laptops don't have Nvidia graphics and only a few OEMs elect to use the cheaper stuff (GT710M, 720M, etc) in their machines.
Maxwell, being much more efficient, could change entry-level graphics in mobile devices significantly, because the low-end desktop and laptops ranges are still using Fermi silicon. Tegra K1 is already the lowest level of implementation for Nvidia graphics, so it remains to be seen what they do with products that have two to three shader modules enabled, who they sell it to and how it performs. At best, I think, the jump will be similar to the move from Whistler to Mars for AMD.
For an Intel system and discrete Nvidia graphics, does Intel play-ball offering CPU SKu's with disabled graphics, while still a decent/cheap enough for builders to add Nvidia graphics and still tout class leading efficiency?
Nope. Its Optimus or nothing in Intel's case. Nvidia is really the third wheel in the mobile market right now.
In the case of the South African market, over 90% of the laptops sold here have Intel APUs. Nvidia is found only in the Samsung and ASUS ranges in the middle market, AMD is restricted to a few netbooks and the MSI GX series and in the high-end laptops market Nvidia has the monopoly on discrete graphics in single and multi-GPU configurations.
I could see many OEMs and boutique builders seeing APU as a better seller as an entry laptop. They can be sold with and APU offering solid graphics, while offering a MXM slot for a premium. Down the road perhaps they can get the sale on the discrete card, while even for new "higher" battery.
But that runs counter to the plan from Intel and AMD to move towards greater levels of integration. The less they have people fiddling with the insides, the better. Also, integrated systems give them even more money in the long run when it comes to spares and insurance claims.