I don't think so. I can understand why Microsoft is losing money on the Surface series but they're improving vastly. Other than the Nokia Lumia 2520, which is quite old now, Microsoft doesn't have any other dedicated Windows RT/Windows 8.1 tablets (developed by Microsoft directly I mean). The Surface Pro 3 has already outsold all previous Surface tablets, if I recall correctly, and I firmly believe the Surface/Surface Pro 4 will make these sales even greater. They're getting better, no one can deny this, and they're easier to buy as well.
I doubt Microsoft will release the Surface series until it becomes apparent that nothing will EVER come from it, not just that nothing is coming from it right this second.