It's not in nvidia's interest to promote a competitor to their own solution (locked to their GPUs exclusively). AMD lacks the interest to push ROCm to consumers

It's not in nvidia's interest to promote a competitor to their own solution (locked to their GPUs exclusively). AMD lacks the interest to push ROCm to consumers, but instead seems to be focusing on HPC deployments, meaning that they don't have to be interoperable either. The only hope is that Intel pushes OpenCL as one of the selling points of their new Arc GPUs. They seem to be starting with the gaming market, however, which isn't very interested in computing. It could be that they have plans to attack the non-HPC market, in which case it would make sense to follow OpenCL. At the same time, Intel is developing oneAPI, so it may make more sense to look at that instead of OpenCL.