First,yes, I'm excited for new wireless technology in trans. There are several companies out there working with this, and a good number of independent folks puttzing about with it, and I do see it in the future.
That said, the wiring is the same for TMCC/Legacy/LionChief/+ as it would be with any bluetooth or similar system, as far as track wiring goes. You only need to worry about more complex things if you plan on using DCS. If you think there is the slightest possibility you may some day want to run DCS you are best off wiring for it from the start. in the grand scheme of all things O gauge it is not any more difficult, and only marginally more expensive...only barely worth mentioning.
In either case, using separate power blocks for each loop, and and sidings is pretty desirable, whether or not you put on/off switches on them. This way, if you have a derailment, or other short, it will not shut down the entire layout. I do recommend switches on each siding, at least, as reports of engines that are parked deciding to start moving on their own are common enough to concern me.
