Usually when talking about this sort of thing, there are other measures in place to help the poor. Just like with the GST, they came out with the GST rebate for low income households.
The main thing here would be simplification of the tax system, which would save billions of dollars - both to taxpayers who have been paying to have their taxes done by professionals and also for Governments which have huge audit teams to wade through the selected returns.
The problem is that the ultra-rich will still avoid paying taxes, as they will just legally move to some country which will not tax them as much (even if they never actually leave the US/Canada).
So the point is, it is essentially an idealist's dream. Still, even then, I think it is better than the convoluted, tangled mess we have right now.
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