"Replace conservative with evidence based."
I think it doesn't matter what it's called. Most of the fads do have evidence. It's just that it might not be measured in the right way, or ignoring other effects.
As an example, the balanced reading approach has evidence that it does work. However, the practical implementation of this approach has numerous interpretations. It's supposed to include balanced meaning between meaning and phonics. It's not supposed to be putting kids in the position of independent reading prior to being able to read. That's just a shitty school, lesson plan, or teacher. Its also supposed to include 1-on-1 reading instruction. I wonder how many kids are getting that at school with the instructor to kid ratio...
Now, maybe the systemic phonics approach will work better, but that's possibly due to the key resources (essentially lesson plans and materials) that the school is using. If it doesn't include forcing kids who don't know how to read to read independently, then any implementation would be an improvement over that, including if it was still an alternate implementation of the same system.