When convoy came out in 2021, people suspected that TruckersMP would die out.
In reality, playercounts on TMP dropped for a week or so and then pretty much returned to normal. Also, for many people it isn't so much just the multiplayer aspect of TruckersMP, it's doing the C-D road and witnessing crashes (or causing them!).
I cant see this having any significant impact on TruckersMP.