The problem with this viewpoint is that the OSI is not the final arbiter of the English language.
Yes, the OSI has an "official definition" of what constitutes "open source" software, but there is a large group of people in the industry that equate the term "open source" with the concept of the source being available, and nothing more. You can shout "wrong, wrong, wrong!" all you want, but I doubt you are going to change many of those people's minds.
The Free Software Foundation has a similar problem with the term "free software".
The people making the definitions are generally passionate about those definitions (for good reasons, mostly, in my estimation). However, I don't think an approach that starts with "Sorry but you don't get to hijack the term" is going to have a net positive effect. If anything, it will probably have a negative effect.