Going away from the open core was the right step. Still, Nextcloud (.com) is owned by the Nextcloud GmbH, will there ever be non-profit organization or a foundation that holds all the trademarks and domains.
Good question and the answer is 'yes'. Frankly we wanted to do this much earlier but it is a fair amount of work and we are still very busy building up the project. The plan is to create a foundation that would own the trademark and, under certain circumstances (like a take-over of the business) have the right to take it away from the company. The board of the foundation would consist of a majority of non-company-affiliated people, and the community should vote on who's on there.
Open questions are what else the foundation should do. Accept and handle donations? Do the conference? Even some development? Or nothing other than the trademark protection? These things have their pro's and cons so we have to have a wider discussion still. Perhaps at the upcoming Nextcloud conference, I'm not sure yet. We will have a solution in 2017, though, I am quite certain of that.