2016 Elections

[Thumpalumpacus]

It will certainly take time to effect a change,

We don't have time.  The republicunts and their libertard leash holders are threatening to destroy the country NOW.

And doing nothing will forestall that how?

Risk killing the hostage is not justifiable if the hostage is the world you live.

Expecting this group of politicians we have in power to do the right thing is not justifiable. But of course, they won't kill the hostage. It was an analogy and not perfectly translatable, and that's why this point of yours doesn't really have much oomph.

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I would rather endure a shitty Presidency or Congress for a few years knowing that the groundswell is building, than endure a shitty Presidency or Congress with no hope for change because everyone insists on voting for parties which have a track record of corrupt self-interest taking precedence over good governance.

Nothing can guarantee change in our system. But doing nothing guarantees the stranglehold of the status quo.

Why would a third party be above all the corruption you complain about above? 

I don't think they would be.  But I do think that having more parties which represent a wider political spectrum would be healthier. I also think that turnover in power-brokers is a healthy thing for the body politic.
Of course no party -- composed as they are of people -- would be immune to corruption. But having more legitimate options to choose from would be more likely to get the voter more responsive party behavior, and, hopefully, better governance.