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For a 65-inch screen, the distance increases to 77 inches, or 6.4 feet. For an 80-inch screen, it's 95 inches, or 7.9 feet. You can do the math in reverse if you're trying to select a screen size for a predetermined viewing distance: Viewing Distance x 0.84 = Screen Size.
CNET, when this topic was covered last, recommended no closer than 1.5 times the screen diagonal, or 0.667 times your seating distance. This allows for a slightly larger TV than the SMPTE recommendation, with a maximum screen size of 72 inches (again, 70-inch models are the closest) for a 9-foot viewing distance.