When you say continuous, do you mean the tax rates? I assume so, because those are discrete numbers. You're basically saying then what whatever the last bracket is, it needs to scale from 35% (in this example) to 100% at a certain income?

I don't dislike the idea necessarily, but I think the problem with the wealthy not paying enough in taxes isn't the highest rate, but what is taxed and how. Selling stock for instance is taxed at a lower rate than income, so we'd need to add a stipulation that if you make more than X, it's taxed as if it's normal income. (You'd have to make some exceptions for retiring people but that's easy enough)

The Inflation Reduction Act had an idea that I think is worth pursuing, or at least calculating how it would go for the rich. Companies making a certain amount of profit in a tax year have to pay some % (maybe 20?) if that'll be higher than their taxes calculated normally. It stops the loophole that lets corporations get away with paying no taxes. If we did that for rich people, I wonder how it would go. My gut instinct is that it would actually help a lot.

Edit: I just described Alternate Minimum Tax, which is a thing already. We'd just need to close loopholes around it by not letting anyone claim a deduction on it.