If Sony and Microsoft are remarkably lucky their combined sales will pass 100 Million units sold ... With how they have sold so far, 10 Million units per year for the next 3 years with an additional 10 Million in their lifetime would be a very good performance; this would put them both at (roughly) 50 Million units.
On the other hand, most consoles see declining sales after their first year (or two) if they're not in the dominant console position and if this generation follows previous generations both consoles will have difficulty passing 35 or 40 Million units.







