Hey @julien-c,
I totally support this idea and the upcoming migration! I think this will heavily reduce workload from the team (now they can review other PRs instead of model cards).
Simply editing a model card + commit it via browser is really great for productivity, because I no longer have to create a PR.
Maybe we could encourage the people to just post a forum thread here to present a potential new model, so that new models are more visible to the community (in the past I just got GitHub notifications for new model card PRs).
Another great feature would be a kind of model card “linting” or checker that scans model card READMEs for e.g. correct yaml syntax or if certain metadata tags (like language or licence) have been specified.