Just to give an idea of tax revenues over the years, look at the chart. While recently things haven't been so good, the overall trend is up. In fact, revenues have tripled since 1965. If we assume that past trends will continue, then the government will take in about $6.5 trillion 45 years from now. To put that into perspective, our population is only expected to be about 438 million in 2050. This means that the federal government can spend twice as much on every single one of us than they do today.
What's even more striking is the implication for the welfare of the average American. In order to take in that amount of tax revenue, actual productive output must increase correspondingly. This means that in aggregate, there will be a ton of money in the hands of private individuals, about 2.5 times the amount today.
What this implies is that the fiscal future is bright regardless of today's rhetoric. A good conservative strategy should be to wait it out by delaying the left's agenda for as long as possible. Liberalism's greatest argument has always been about helping those in need while it's agenda has always been one of control. One day, we will be rich enough to lift up the needy and cut down the legs of liberalism.