I still recommend that people take advantage of the tax advantaged investments available such as 401(k) and Roth type savings vehicles, but as the gov't gets more and more desperate for revenue, they're going to have to look around to see where is the money.
There are simply not enough rich people to fleece. You could take every penny of the top 1%, and while that's a ton of money, with a budget of $6 trillion and growing that'll be gone quickly. The real money is in the middle class, where all the people are. While each person doesn't have very much, collectively, there's a lot. The gov't will employ a divide and conquer strategy, just like they do now with the rich. They'll divide the middle class into two camps, the "true" middle, and the "upper" middle, and those people are bad as they've obviously taken greater advantage of tax loopholes to avoid paying their fair share.
The next group of billionaires will be those who build the industry of moving assets to avoid taxation. It's already a big industry, but as govts get more desperate, the customer base for these services will grow very quickly. Just where to put it all.... LOL