[UPDATE #2: 10/10/23] The console versions of Ticket to Ride: Classic Edition did not delist on October 3rd, 2023. They will remain on sale until April 2024, when the new console versions are ready. Per Marmalade Game Studios:
The current version developed by Twin Sails will be rebranded “Ticket to Ride: Classic Edition” in every store where the game is currently available. More importantly, this version of the game will be removed from PC and mobile stores from the 3rd of October – with console editions of the game remaining available until April 2024 – and in app purchases, such as acquiring new maps, will no longer be possible.A NEW TICKET TO RIDE® VIDEO GAME IS COMING SOON – September 18th, 2023
The original post follows.
The creators of Ticket to Ride the videogame have announced –
a) the rebranding of Ticket to Ride to Ticket to Ride: Classic Edition
b) the removal of that version and all 2, 10, or 11 pieces of DLC (depending on platform) from digital stores on October 3rd, 2023, and
c) the upcoming publication of a new Ticket to Ride version for PC, console, and mobile
That’s a lot! The Steam news posting seems to go into the most detail with:
The current version developed by Days of Wonder will be rebranded “Ticket to Ride: Classic Edition” in every store where the game is currently available.
It is important to note that this version of the game will be removed from all the stores from the 3rd of October, and in-app purchases, such as acquiring new maps, will no longer be possible.
While Ticket to Ride: Classic Edition will no longer be available for download from October 3rd, current owners will retain access to the game in their game library and can continue enjoying it without interruption. This change ensures that players who already possess the game and  DLCs can play and experience the joy of Ticket to Ride: Classic Edition even after the version becomes unavailable for new downloads.
They continue in the post with:
[A]s time marches on, technology advances, and gaming standards reach new heights.
It has become increasingly difficult for us to ensure the best possible gaming experience for players of the classic edition of Ticket to Ride.
The engine on which the game runs was specifically developed for it, with its own technology – an engine which is not supported anymore by any of the platforms you can play the game on.
Thus, it makes it impossible to create new content for the game, to make any significant updates or ensure the game’s stability.
Marmalade Game Studio, Days of Wonder, Asmodee Entertainment and Twin Sails Interactive are excited to announce a new Ticket to Ride video game for PC, Consoles and Mobile.
This new game will be a reimagining of the classic edition that you’ve come to love. While we recognize that change can be bittersweet, we’re confident that the new version will captivate you with its enhanced features, modern design, and even more immersive gameplay.
It will be releasing on Steam in November 2023, with the other platforms coming out in 2024.
The new Ticket to Ride game is being developed by Marmalade Games.Ticket to Ride: Classic Edition Steam news post – September 27, 2023
The post provides a bit more detail and a small FAQ section with the biggest question answered – yes, you’ll have to re-buy the game and DLC to have the new version.
The GOG version and its 10 DLCs has also been officially tagged for removal based on this post in their forums. While Playstation and Xbox don’t have an easy mechanism for delisting forum postings, the game is already re-branded on PS4 (with 10 DLCs) and Xbox One (with 11 DLCs). While the Xbox 360 version hasn’t been renamed, I wouldn’t be surprised to see it get delisted next week along with its two DLCs either.
Thanks for the submission, MrFortyFive. We’ll get a page opened and add it to the Watch List.