I Disagree that Respiratory physiotherapy is a down going field
I have been working in this field for the past 5+ years (around the world)
I believe the problem is physiotherapist generally does not look for evidence
there are enough and more evidence for us to continue our work.
More over very few physiotherapist read journals and articles and keep themselves abreast of the develpoments in their field
Very few physiotherapist are again interested in conducting research and bringing out research output in their field of study.
When physiotherapist start reading journals and conducting very good research then and only then we will be able to stand up to other professions and do justice to our profession.