I agree with point (2), that the government is overspending and will need money from somewhere. Given corporate taxes keep failing as a percentage of tax revenue, raising individual tax rates seems likely over the coming decades.
Another way to look at this, is you're more likely to use Traditional IRAs in the next several years. So the best way to "tax diversify" (pre-tax, after-tax) is to have a Roth now, and Traditional IRA for the next few years.