Console market needs generation-long stability MORE than HW power. A generation too short can't recoup the investments and it can build neither a large user base nor a wide game library.
Loss of platform stability in time, lower profitability both for HW and SW, all to have HW that still can be beaten by mid-range PCs within a year, games more expensive and with lower profit margin, due to royalties to platform owner and to less time available to master programming on a platform, consoles would become sitting ducks and PCs, mobiles and possibly other platforms would wipe them away forever.