Planeaddict
Whilst I absolutely agree it would be good to have such a viewing area, that just isn't what we do in the UK - look at all the indoor viewing areas, or land side terminal views there are in the UK - I'm struggling to think of many, certainly any which are any use.
Contrast with Germany and Switzerland.
If BHX has the money available to spend, I would say there are plenty of more worthwhile projects that could be undertaken to improve the passenger experience.