Harav Yoel Ben-Nun has managed to put into words, what many of us have been feeling. The fact that there was going to be a demonstration against Harav Ovadia's Psak Halacha regarding conversions, is the final proof that we are not dealing with a Halachic argument, but with a political one. The very idea that you could hold a rally against a psak Halacha is ridiculous. If you disagree - prove your point by the force of your arguments.
(I'll point out that Harav Yoel has some very harsh words against Harav Elyashiv, which are sure to make Harav Yoel's life much more difficult).