I'm curious...how have you arrived at the conclusion that raising income taxes would not affect investment at all?
How have I? I just know that income taxes have nothing to do with investment or profits. They are deducted from income you receives by providing services to others. In other words, these are taxes on your salary.
Again, we are not talking about income taxes in this case. It would not help them to zvoid capital gain taxes either -- because their "tax free" profits will be taxed as soon as they repatriate them (i.e. when they bring those money back in US).
Nobody -- the US government doesn't have to pay of its debt ever. It can roll it over forever -- or, rather, until becomes irrelevant comparing to the size of the economy. That is what happened to our WWII debt.
There is a matter of interest payments, but right now investors are begging the government to borrow their money, so the interest are near zero.
Your share of the National Debt is now approaching $40,000. If you're around in 2030 it's projected to be over $100,000 if we keep on going the way we are now.
And what will be an average income household income in 2030?