Seems unlikely, the TSW7 FAQ says "Monthly mastery challenges will continue to take place and reward players with unlockable posters that can be viewed in-game".
Hey folks, This month's mastery is still coming, but will be a tad late this month. Once we know more, we'll share an update. All the best, Jan
Conspiracy theory I know, but is somethIng going on at DTG we don’t know about? Procedural or personnel changes? Anyhow, now I’ve figured out how to restart the BR285 in SimRail after loading a save game, I shall be continuing my run from Warsaw to Katowice. I’ve also got a good game going on Transport Fever 2 (reluctant to buy 3 due to price and hardware specs) plus some OMSI 2, keeping me happy.
The weeks leading up to their big annual release and the weeks thereafter are probably by far the busiest of the year. So if any monthly mastery is bound to get mangled in their busy schedules, it's this one
Jan already explained on this very page that the monthly mastery will a bit later this month. Is it annoying? Yes. But I'm sure they have their reasons for it being a bit later. All we can do is wait patiently for it to go live
I could prob see it go live when they release the next roadmap which is prob next week maybe? Idk rlly