"Sola Scriptura is a dangerous superstition."
Not as dangerous as relying on expedient tradition interpreted by professionals with a position to protect.
Superstition remains a superstition. It will cease to be that when a line on the Scripture is discovered that says "scripture is sufficient for all mattrers of faith".
It is, of course, highly expedient for reformers with no other qualification than a burning desire to redefine Christianity.
I understand how it is others do not accept what we Teach. I really don't understand why our authorities ought be charged with malign or self-interested intent.