It depends upon the criteria you use. If you frame the question thus:

Is corruption bad enough to warrant the watering of the tree of liberty?

...then we're long past due (say, 150 years). However, if you word it thus:

Is there enough popular support to water the tree of liberty potentially successfully?

...then the answer is, "No." Too much of the populace is too ignorant and apathetic.

The Colonial tactic of printing pamphlets and books on the nature of freedom, Natural Law, government abuses, etc., needs to be employed now. The blogosphere is a good, modern substitute, I believe, but it won't be enough. Word-of-mouth is needed, too; in my experience, liberty-lovers do tend to be somewhat vocal.

I think there's one critical component missing, though, and I just don't see it happening: the churches need to be "pulpits aflame with righteousness". The American churches have long since sold their souls to the devil, so to speak, having perverted God's Truth so badly as to be unrecognizable by the righteous. Politics generally aren't preached. When they are, they're treated so badly and so incorrectly that any true Bible-believer would puke. If so-called Christians cannot even read God's Word properly, they have little hope of correctly applying it to government. The fallen state of the church may very well spell the end of any righteous revolution before it begins.