I can understand their frustration, but really I can only echo what others have already said. How on earth would a small backwater football club compete with one of the largest retail giants in the western world? As has been mentioned sainsburys provably contract a whole team of the slimiest lawyers going specifically to deal with these legal wrangles - particularly considering their experiencing continual decline in profits.
Furthermore, the UWE stadium was a complete con anyway. How can you call it the UWE stadium when only two UWE sports teams were allowed to use it for one game a year? It was always going to be the Bristol Rovers stadium @ UWE. And on that subject, a stadium that would be consistently half empty would send them the way of the likes of Darlington!
In all, whilst it is disappointing for Bristol that a second national class sports facility isn't being built, it is most pleasing that Rovers are definitely not getting one and will be spending another few years at Bristol premier non league standard cabbage patch.