I don't see the triggers being anything like the bargain priced accessories we currently see.
Looking at the price of the current YN proprietary triggers, there shouldn't be much of a price difference for the rt version - it's rally just some cents of electronics in a plastic casing, they don't even have the lcd display of the st-e3.
That would be a fair comment if cost per unit had nothing to do with perceived value per unit. Do you really think a YN-622 costs anywhere near four times as much to make as an RF-603? An RT YN-642 trigger would cost appreciably more than the 622, even if i was only £20 more that still takes it to £100 for wireless control of one flash, hardly the budget option that the RF-602 got us into at $25 a set.
If they didn't do the LCD it would be considerably less attractive, the ST-E2 doesn't have one so the 622 doesn't need one, but the RT system has much more functionality and digging through the camera flash menu becomes a chore with all the enhancements.
The way I see it whilst some people will always be excited at saving a few hundred dollars (or a hundred quid or so) once people start using the stuff and limitations start showing up then people see less value in third party, no new RT system option will be cheap and whereas with the current third party radio ETTL control that offers something Canon never did, going against direct competition with less functionality, as opposed to no competition with enhanced functionality, seems to make little sense to me.
But as I said, I have been wrong many times before.