If Dudley do not want the glass it might be time to find someone that would. No reason it should stay in the UK as long as it as assured of a permanent and accessible home. There are probably several museums in Europe, possibly even China, that would leap at such an opportunity. These days UK Museums seem to go for multimedia experiences to draw the crowds in and boost their 'performance' ratings. Culture has little value in that equation beyond its realisable commodity value and that is usually made elsewhere. Glass falls low down on virtually all museum agendas, look at the V&A displays!
I guess if the idea got taken up, the press would have a field day as there is nothing like stirring up a bit of national fervour to sell papers. It might also get the attention it deserves from Parliament which the local efforts do not seem to have managed to really stir up.