I'm not so sure that we would want one community around one package for electrical engineering. The industry has always been relatively stagnant, such that even a mediocre UX like Altium's is a breath of fresh air compared to Zuken, Mentor, Cadence, etc. and we could do with a lot more experimentation in open source ECAD to make up for the missed opportunities. That means a lot of orthogonal experimentation in file formats and version control, DRC, standardization of schematic and PCB modules, and so on that should not be coupled to one project.