I strongly suggest they stay with the Terminal server. It depends on the OS Terminal Server is running on (i.e. Server 2008, 2012 etc). The newer servers allow for very slick modes so that launching MAS looks just like running any other local desktop application.
IF they try and run MAS truly over the wan, any performance or disconnects is going to leave alot of hung processes, potential in use files, potential data corruption, very slow performance, especially with crystal based stuff etc.