It's not a bad idea, though it has no chance of ever becoming widely adopted. Inventor Paolo Bizziocchi proposes that it would be easier to read text if it were sloped downhill from left to right, so that each new line would be at the same height as the line just finished. This would allow "a quick-reading without mistakes and delays whatsoever."
Bizziocchi filed a patent
that includes this helpful illustration:
What I don't understand is how this was patentable. People have been writing with lines at all kinds of crazy angles ever since writing was invented.