That should be somewhat answerable using software attach ratio. XB360 was <12 units over 8 years on the market? I don't see any data anywhere that suggest tie ratio is greater than 2 titles a year. I guess that doesn't include download titles where smaller titles can be entertaining short-term time sinks. It also won't include borrowed games and second-hand sales. A think a predictable $120 a year from all owners would be highly valued. Maybe MS should try their rental idea again, including Game Pass alongside a console rental scheme? Seems to work for mobile phone operators. $20 a month for a console and all the games you want, $240 a year, ~ $1000 over 4 years, less $250 for hardware, for 30 million owners would be over $20 billion, or 5 billion a year give or take. That sounds pretty solid!