I had to remove two of the three negations in the title to understand it: You need a non-mainstream opinion to be successful. Does anyone else have to do this mental exercise to understand?
I really like the post though and I agree that we need different thinking people that stand their ground. It's a shame so many give in to the 'mainstream' to save themselves from a few weird looks and some embarrassments.
If you're successful, then you have a non-mainstream opinion.
Assume t0 < t1
Original: NOT(NOT(Mainstream(t0))) ==> NOT(Succesful(t1))
Contrapositive: Successful(t1) ==> NOT(Mainstream(t0))
Edit: Small edit for clarity and spelling.