The way I see it, there are two types of people who talk in shul:
1) There are the people who will talk in shul no matter what. They don’t take davening seriously, they aren’t really interested in davening, they come to shul because of social pressure or some other reason. The issues brought up by the OP have nothing to do with this type of person – they will keep talking no matter what.
2) There are people who generally don’t talk in shul, and take davening seriously, and come to shul in order to daven. However, when certain parts of the “davening” (e.g. mi shebeirachs) are dragged out, these people feel that they are basically expected to sit there and do nothing, and therefore they turn to talking during those times (Of course they can do other productive things like learn during those times, but I think most people prefer to daven during davening and learn during their learning seder). For this type of person, cutting down on the “shlepping” very well may reduce the talking.