Probably / Maybe.
Being that I work in IT and love tech I tend to be an early adopter. For train control however some key points for me stand out as concerns for iPad control.
1- The interface. It has to be fast and easy to use. Neither Lionel or MTH has shown me a particularly intuitive remote yet. The new Lionel Legacy remote is awful! Finding things like disable smoke/enable smoke on a Lionel remote is a joke. AUX1+2+5+DIR+stand on your hand + do the hookie pookie. Who thought that crap up at Lionel? Breaking out the Lionel Manual or the DCS Handbook every time you want to do something simple! Anyway, both remotes today leave a lot to be desired. Yes I get the fact that they are trying to pack a huge amount of functionality into something I can hold in my hand. So now with an iPad interface it better be a huge improvement in ease of use and not just a way to pack more hard to use, impossible to find functions.
2- Ease and speed are my biggest concerns with using an iPad. Example: I want to throw a switch for an approaching train. I'm in the middle of going to select switch, find the switch, scroll, looking, looking, train is coming, oh crap I need to stop the train and I haven't found the switch yet, but I can't get back to the train in time, OH NO where is the emergency stop. SIGH.... I just wanted to throw a switch. That analog control panel is looking VERY good right now.. HAH!
As it is now I find myself always carrying 2 remotes. 1 for engine control and 1 for layout control. That way I can always stop the train if I can flub through finding the switch fast enough. Carrying and using an iPad is a 2 handed affair. So it MUST have an agile interface.