Are you aware that federal income taxes were collected long before the case (Pollock v. Farmers' Loan & Trust) that basically triggered the adoption of the 16th Amendment? They go back to 1861. The issue in Pollock was not that the income tax was unconstitutional (the income tax on wages was decided unanimously to be constitutional in 1880 and held to be an excise tax in Pollock), but that taxes on income derived from property (rental income, stock dividends, etc.) were direct taxes (as opposed to indirect taxes on wages) and so had to be apportioned by state populations. It then spent the next decade doing contortions trying to fit various taxes challenged after the Pollock ruling as excise taxes so as to not deprive the federal government of revenue from many other sources.
The 16th Amendment merely allows taxes collected on all income, whatever the source, to not be apportioned by state populations, taking the issue out of the courts' hands completely. Repealing the amendment wouldn't end the income tax or the IRS, but instead justify a larger bureaucracy to ensure that income from direct taxes was apportioned properly, or else a rush to the courts to challenge pretty much every tax and a resumption of the judicial contortions to keep them in place.
And you really should get up to date on your recent history. While I'm not sad to see Saddam Hussein gone, there were no unconventional weapons found, save for a few old artillery shells buried more than a decade before. He really had dismantled his programs, but tried to make it look like maybe he didn't in case Iran got the bright idea of starting a new fight.