Apple loves to play suppliers off of each other to its benefit, so I have little doubt that Apple would entertain offers from Intel should the latter be able to actually deliver.
However, it's pretty telling that Apple chose both Samsung/TSMC for the A9 and is going with TSMC exclusively for the A10. There is something keeping Intel from winning these contracts and I don't think it was a question of price since I'm sure Intel would have loved this business.
I am sure Intel can hardly wait to build a Core competitor for Apple for just $10-15 foundry profit. This is where this silly fab for ARM idea is going to eventually lead, imagine an A9X at 2.5 GHz on Intel 14nm rather than at 2.25 GHz on foundry process then aimed against $100+ Core-M.