Still want 8yrs for this one, at least for Sony / PS.
PS1 > PS2 > PS3 were 6yr gaps.
PS3 > PS4 > PS5 were 7yr gaps.
With covid, a prolonged cross-gen period, the Pro releasing a year later this go around, game dev cycles being significantly extended and chip costs no longer dropping, I think a push to 8yrs is ideal. I also think 8yrs with a midgen refresh at the 4yr halfway mark is a perfect cadence which also gives enough breathing room in the 4yr gaps to release successors to Portal, VR, other accessories & even a Portable without overwhelming the user with high cost items in a narrower space.
2026 (9th Gen Yr 6): "PSP3"
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2028 (10th Gen Yr 0): PS6 Launch Console/s + Basic Accessories
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2030 (10th Gen Yr 2): PS6 Stealth Refresh + Additional Accessories
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2031 (10th Gen Yr 3): VR & Portal Refresh
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2032 (10th Gen Yr 4): PS6 Slim & PS6 Pro
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2034 (10th Gen Yr 6): "PSP4"
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2036 (11th Gen Yr 0): PS7
etc.