what would happen to an Nvidia-hardware-only system with nvidia kernel module (which blacklists the nouveau kernel module) + nouveau graphics userspace, which under [nvidia-kernel-dkms Recommends: nvidia-driver | libcuda1] would be the result of trying to install OpenCL on a previously nouveau-using system.
Did you test this (i.e. "apt-get install nvidia-opencl-icd libcuda1" with Nvidia hardware but no already-installed *nvidia* packages)? https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=751082#27 suggests the result is no graphics.
(Having it be a Recommends: nvidia-driver rather than a hard Depends already allows the "headless GPGPU" case, and cutting nvidia-opencl-icd -> libcuda1 is enough to fix the original "accidental nvidia-opencl-icd on inappropriate hardware" problem.)
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