Why do you think AMD quitting x86 would make any difference to the ecosystem? The x86 ecosystem is Intel, it is Intel building, developing and giving it direction, AMD just piggyback on all this in order to sell subpar products. If AMD quits tomorrow we'll see a few fanbois mourning but for x86 it will be business as usual.
Actually it would change the market very dramatically... AMD was the only one who sells Quad Cores sub $100 (still with the quality of a Intel Dual One on FM2 or a i3 on AM3+) and they made Intel put the Atom core to a trashy prices... when AMD goes away, Intel would be free to put the Dual Big Cores avobe $100 and put the Atom Cores at the prices of the Pentium Dual Core. Or simply taking down the Dual Core tier and putting liek this.
- Sub $100: Atom Dual Core
- $100 to $200: Quad Atom Core
- $200 to $300: Core i3
- $300 to $500: Core i5
- $500 and above: Core i7
And the Big Core who becomes dual, could go to OEM or Bussiness. Consequences of the Monopoly and since they are allies with the US Government and the Israel one, the regulators won't exist for them. And people will pay that since there will be no competition. And VIA actually could get sued due the alliance with the Chinese (US enemies).
Similar thing to nVIDIA. nVIDIA alone won't resist Intel's juggernaut in everything. Before they goes bankrupt, they quits to another easier markets like mobile one (they are dominating in GPU here).