They won't be the best foundry out there, especially not without a process lead, which they are about to lose at 10nm I suspect (or just a very thin lead).
Goldmont isn't central to Intel's business. How well it is designed has very little to do with the fabs. And I really can't see how they are going to lose their process lead in any relevant timescale with the amount they invest into it and their interest in keeping a performance lead.