Obviously if the runway was suitable,and some airline wanted to operate,the terminal would be quickly upgraded. Until the service is demanded,nothing will happen.
My other point is that from a SLF point of view,convenience is more important than facilities,although if people started using the airport,services would improve,as someone always wants to take your money,i.e. catering,shopping,souvenirs(Dundee cake,sacks(jute!),Beanos!)).