It's all ifs, buts and maybes at present. However I'm fairly certain as noted a couple of pages ago, DTG's No.1 priority will be selling DLC for the new platform and that catering for the hobby end creator will not be high on their priorities. We have seen that to some extent already with their existing TS20xx product, moving away from a standard "default" product to one where the base routes change each year, undocumented "improvements" to the editors which leaves those outside the inner circle of creation using trial and error to figure out how to use the new features.
All Trainz really needs is a decent timetable and scenario editor for the player train, combined with AI control of signalling and route setting - as I said earlier without complex use of scripts or commands, it could still keep the edge especially with the easy to use sandbox. Get away from the Trainz CE and UTC era of the player having to switch points and figure out the route as they go along. If the current programmers can't figure out how to do it, bring in people who can. Make a route - whether freeware or DLC payware - for TANE equal to if not more appealing than its opposite in TS20xx or the new TSW. While the base platform for running trains remains weak, despite the ease of building, when it comes to playing trains I opt for TS20xx or increasingly these days old MSTS routes in Open Rails. Despite my initial scepticism and a few ongoing issues, the latter is proving to be a very useful and competent sim.