There is no reason to believe that Apple just stop with their M1. Now they have a winning formula, they can scale up easily. They can easily fit at least 64 cores into workstation TDP budget and knock the socks off anything intel has by large margin. They can also produce 12/16 core chips for their desktop market, and by the time those come out they would have majority if not all heavy workload programs ported. I believe 16 cores in 65/80W envelope would be easily achievable. Especially if you take out iGPU, and use external GPU.
Ever since M1 came out, it was obvious that Intel is out of Apple HQ for good