I'm intrigued by the idea that the board sacked Still because of fan pressure and because the fans had turned against SR. I'm fairly confident that they sacked him based on results and, quite probably, feedback from players.
Yes, there was some chanting from the Northam end during Still's final game. But I doubt if this was the deciding factor. After all, these fans spend quite a lot of time chanting about Pompey and, now, Nathan Jones. The idea that SR are holding off on a new manager announcement because they fear a fan backlash is also doubtful. I'm sure that they'd rather take the fans with them but they will announce when they have made a final decision, regardless of fan chants. They are either giving Eckert a long trial period or they have not yet identified (or persuaded) another candidate.