I don't have so much of a problem with CUDA staying closed, but rather Nvidia sabotaging Nouveau through signed firmware which they don't release (and obfuscate in their blob). Nouveau would be probably be decent by now (not as fast or feature complete, but usable for real workloads on newer cards) if it weren't for the fact that Nvidia has added features which have the direct effect of making it impossible to have a competitive open source driver.
Maybe something will change on this soon. There was speculation about this: https://www.phoronix.com/scan.php?page=news_item&px=NVIDIA-O.... But I'm not holding my breath, and it would be nice if the solution wasn't "wait and hope until Nvidia releases the software necessary to control their GPUs".