I have heard/seen this or similar expectations from lots of people, which is interesting to me. I see no reason for them to do anything more for modding. To me it seems current state of modding is deemed good enough and some small improvements might come now and then like it did during the EA but I highly doubt there will ever be some big modding specific update. As for not breaking existing mods, I don't think that is a concern of TW yet and unlikely to be any time soon.
For the updates there is one thing I am curious about. I know TW has different teams focused on different areas such as graphics, gameplay, campaign, MP etc. It is normal for teams in a company to be out of sync, one team far ahead of the other in progress. Usually game companies have multiple projects being developed at the same time so resources can be reallocated. We know from job listings that there is at least 1 other project but will the teams that don't have much to do in Bannerlord anymore be moved to this other project? Will they start working on DLCs? Or another likely option, we might still get some not content updates in some areas that we didn't expect. Like performance and/or AI. And I would expect that to break mods.