For PS4 to sell 100 millions:
If a generation will be 5 years it needs to sell 20 million a year (in average). So if first year will be 15 millions, next year it should be 25 millions.
20 millions a year means selling 400 000 a week, globally, in average. Currently it sells 4 times less.
So basing on this I think that industry is shrinking and Sony will need a miracle to get PS4 to 100 millions lifetime sales.







