I'm not a Dominos fan but think an open Dominos is better than a empty unit. As I've said in the case of the gaudy shop in London Road its a relief to have some trade going on rather than a decaying premises. That particular shop is doing very well and I know a whole range of people who use it regularly. The business model, scorned by many, has actually worked in Forest Hill.
Re the Old Bank, there was a middle range restaurant there before but no one used it. People have a lot less spending power than they used to have so either they will choose to use it or it will go out of business. The only way to prove or disprove a need is for the market to declare which way it wants to swing. Other than that, I'd let them get on with it, and we'll soon see.