I think it's still up in the air whether a decent non-Apple laptop/desktop class ARM chip will come to market before Intel and/or AMD narrow the efficiency gap enough that the hassle won't be worth it.
Who would make it? Do the likes of Broadcom have the vision & ambition to push into that class? I could see it happening if AMD decided Arm was the way to progress, but that would be bold too. (AMD does already have an architecture licence though I believe.)