Considering how much money we plow into these bodies, this could be a way to protect that investment. New sensors, speciality sensors, crop vs. FF etc. with firmware upgrades for improved processing etc., could let bodies live longer than the current "too few" years. But I guess you would need to upgrade your processing power as well, so I wonder how realistic it would be.
5DIII, 1DX, 8-15/4L, 16-35 f4L IS, 24-70/2.8L II, 70-200/2.8L IS II, 70-300/4-5.6L IS, 200-400/4L IS 1.4x, Zeiss 15/2.8, 17/4L TS-E, Zeiss 21/2.8, 24/3.5L TS-E II, Zeiss 35/1.4, Zeiss Otus 55/1.4, Zeiss Otus 85/1.4, 100/2.8L IS Macro, Zeiss 135/2, 600/4L IS II