The legal right is the fact that they've gone thought the process of becoming a trust.
The rest is just opinion, whether we like it or not.
We can all moan, with good reason, but as is stated above people can change it from within by joining and putting their views across. Presumably, there will be some means by which an egm or a vote of no confidence can be tabled, but you'd have to be a member to do so.
As to whether another st can be set up, I don't know but I doubt it.
Personally I can't be arsed joining and going through the hassle, rightly or wrongly, so I'll just keep a distant view on it.
It would never please all come what may, but I would imagine that carrying on as they are, someone will eventually challenge the board or it will gradually fade away.