You can simply leave the game for a year instead of asking the devs to stop developing because you dont like patches that break your mods. Also you're very shortsighted if you think modders wont come back when the game is done.
There are a whole ton of factors that go into any decision. I don't know that your specifically addressing earlier my comments but your response with fit well a counter to them so I wanted to respond.
There are a couple things to consider. First is that the game has been in Early Access for a year with them indicating that they expected EA to only last a year. In a way that is kind of a promise as well. That promise was, "Buy the game now and we will have it ready to go in about a year." Well it looks like they aren't going to deliver on that promise and that has to be taken into consideration when deciding how much longer to wait to deliver a product. Basically you have to ask how much tolerance your player base has for delays before you reach a critical tipping point which leads to my second point.
Second, despite calling a game EA, the second the game is available for money people start judging the game. They have a tolerance for some patching and changes but that tolerance is finite. Despite the EA tag there are a group of players that have played the game, lost interest and quit. Each day that EA goes on, more people will play the game, lose interest and quit. There are some people right now that are looking at the state of the games progress, losing interest and quitting. This includes people who would have volunteered their time to mod that game as well. If too many people lose interest and quit, the community become weaker and the game may not have a strong future. Basically you have to ask how much tolerance your player base has for delays before you reach a critical tipping point.
Third, you have to ask just how much will be improved and how long will it take to improve it. Based on the lack of progress that I have seen over the last year, I honestly don't think that, even with another year, we are going to see a significantly different game. Will their be improvements, yes but will those improvements actually justify the time it takes for those improvements to get into the game, we don't know. That is also something we have to consider.
Fourth, based on what happened with Warband, the devs and many if not most players know, that mods can correct most of the games shortcomings and they can often do it in a way that satisfies more people due to the fact that their are usually multiple versions of any given mod each tweaked different this appealing to a greater audience. Because of this you have to also consider just what actually needs to be in the game and what can be left to mods. Further, I had someone point out to me the other day that if too much is added to the base game, this might actually restrict what modders can do to change those features through a mod. Personally I found this a good point.
To sum up what I am saying, there are a lot of reasons why wrapping it up makes sense. First they promised EA would likely only last a year. Second they are losing players and modders. Third, there hasn't really been much progress over the last year and it doesn't like like even if they took longer that many of the things they told us would be in the game are in the game and forth, modders, given a stable platform, will offer fixes for many things players don't like, add many of the feature that are missing and then some and overall improve the game. That is a pretty good case for them coming up with a exit strategy in the short term and one I think they should be considering.
Now, I am not saying that their aren't counter arguments to each and ever point and many of those arguments have already been opinioned on this thread but whatever the decision Taleworld's makes you do have accept there are strong arguments for wrapping things up and then try to find a balance.