Why are you telling these stories rather than showing data? If someone makes a proposal, they have to back it up with data, no?
If you do your homework - define your success metrics and gather the data and show it to the community - you will get immediate agreement, don't you think?
If you don't have the research or data skills to do this, ask for assistance. Many will be happy to help, myself included. We have some excellent statisticians doing good work. You can also check out this post for some ideas for success metrics.
More science, less arguing for the validity of your logic and telling stories to convince others.
What is a big problem with a more scientific approach as I'm suggesting? @vandeberg mentioned that the social sciences have been struggling due to the complexity they are dealing with and difficulty in controlling for variables. However, this can be overcome with appropriate methodology and research and data skills. Books such as Lean Analytics lay out many of the aspects in detail.
If you don't want to do science, fine, but the probability of things going wrong increases, and I don't see too much acknowledgement of that.