In a perfect world....Yamaha opens a US custom shop for higher end instruments, both Yamaha and Guild. AFAIK, they (Yamaha) have never had a US manufacturing presence. Yamaha leverages their considerable expertise on making factory instruments towards the Guild line for mass market instruments in the Pacific rim, and it's a win-win.
But who knows. Yamaha, like Guild, has never had an out-of-the-park home run of an electric guitar. They've been more respected in the acoustic field, but never had a killer there either. And to honest, I have owned several (and still own) Yamaha guitars, and while they have always been an excellent value, they've never had anything that's truly amazing.
But they might actually make the Guild brand a focus, unlike Fender, who really never knew what to do with them.