I’m all for them addressing some of the larger shortfalls of Train Fever by aiming towards a sequel rather than attempting to patch it into the existing game. Train Fever is fantastic as it is, but it could very obviously benefit from some deep core changes in the game design, and that’s not really possible on an existing game. Working on a sequel that takes the original game as a base to build upon would mean they could potentially make far more headroom quicker than if they try to tweak the existing code.
What would really make this a great direction to take would be if they offered that sequel to those who bought the original game at a reduced price – expansion-pack prices – around the €12-15 mark. That would reward fans for buying into their earlier, less polished work, while still freeing them up to make the more sweeping changes it sounds like they’d like to make.