Not a terrible idea at all, I think, for people who like using their phones/tablets while gaming (not for me, personally).
As far as I remember, Warmachine had a free fan-made app called... I don't remember... but it was very popular and was out for years before PP eventually made their own commercial version, War Room, which it sounds like is what you are basing the idea on.
So if AR were to follow the same path, I imagine two things would need to happen before it would make sense for RRG to look into app design.
1. A fan would have to make the app first, and it would have to be popular to show that there is a market for it.
2. The game would have to get way more fans.
It's still a niche luxury game as far as I can tell, with only a fraction of the number of players that WM has.