"I don't see where I was criticizing Lionel."
My apologies if I misinterpreted your comments. Nonetheless, offering MTH's plans for a new handheld as a realistic consideration now is optimism at the outer limits of credibility, for reasons well covered on this forum. A wait and see posture seems most balanced for a company that's gone from dissolution to fragmentation over the last year or so.
If you want a handheld to talk with your wi-fi system, Lionel is a more realistic target for hobbyist pressure/appeals, in my view. They appear to be a going concern with good momentum, as far as one can tell, at least at present. And they have a catalog, and that catalog has a handheld remote that will talk with their current (sort of) and future command base. Convince them that the cab-1L needs to be upgraded to control all Legacy functions by some technical magic. And as a potential bonus see if they would be willing to develop the software/cabling to talk with the old TIUs and the new Wi-Fi-TIUs. Lots of folks have PS2 and PS3 locos they want to control but there is no current product in a catalog that can control these in the future. This a potential new market for Lionel, rescuing possibly orphaned competitor product that is widespread in consumers' hands.