Moving to a new game would require SCS to renegotiate licenses for dozens of truck brands, a process that is both costly and time-consuming.
What's the timeline for all the new upcoming content? : r/trucksim Euro.Truck.Simulator.3 (GamingBeasts.com)
Articles or features claiming the existence of "Euro Truck Simulator 3" on third-party sites often rely on rather than official announcements. Moving to a new game would require SCS
Instead of a sequel, the franchise is focusing on major engine upgrades and massive content expansions for ETS2: Euro.Truck.Simulator.3 (GamingBeasts.com)
Significant expansions like Nordic Horizons and upcoming DLCs for Iceland and Ireland are the primary focus for 2025 and 2026.
With over a decade of DLC purchases, a sequel would risk alienating players whose current map expansions would not carry over.