> A world where Ron Paul gets elected president and/or gets any of his legislation passed is a substantially different world than the one we live in today. Hugely different.
Sure, but the ability to build a minimum winning coalition on eliminating social security is pretty much irrelevant to finding a minimum winning coalition on eliminating income tax.
> If it were possible for the general population to somehow wake up and realize that Social Security is a ponzi scheme and that it's not sustainable long term
Its not possible for them to "wake up and realize" that because its not true, but its certainly possible for them to be convinced of that; indeed, that's a fairly common idea (at least, if you take out the "ponzi scheme" part) now. What is less common is the idea that the best way of dealing with that is to eliminate the program entirely rather than addressing features that make it nonsustainable. [1]
> then it's ENTIRELY conceivable that said people might listen to the "income tax isn't constitutional" argument as well.
Sure, its entirely conceivable that people might listen to that argument. That's a bit different saying that it is likely that he would also be able to eliminate the income tax (there is a big gap between "conceivable" and "likely" and another big gap between "listen to" and "agree with".)
> The political landscape would have to be so incredibly different for social security to go away I can't even really comprehend it.
I have no problem with that description, but that's an argument against any assertion you might make about what would be likely in that case, not an argument for it.
> You can speculate that people wouldn't both abolish social security AND the income tax.
I could, but I haven't. A statement that your claim that a particular outcome is likely is not supported by the argument you have presented for it is not a claim that the outcome is impossible.
> I speculate that such a thing could reasonably happen.
There's a difference between speculating that a thing "could reasonably happen" and asserting, as you did previously, that it is likely.
[1] E.g., http://www.gallup.com/poll/1693/social-security.aspx