There are implications in the logic, of course. Alpha’s calculation is based on 106 million mobile page views in June and a guess that the average mobile user reads 100 pages a month. If the real answer is 200 pages per user — say, 6 per day — 1 million mobile users is now 500,000. Second, the NYT mobile app has been downloaded 4.5 million times — so even if the real mobile readership is 1 million per month, that’s only 22% of app-grabbers who find the Times intriguing enough to engage via mobile. Third, the iPhone, and now the iPad, are driving bursts in experimentation by consumers who download apps … but there is always a falling usage pattern over time. Given the comical missed forecasts of mobile advertising revenues, the jury’s still out on whether mobile adoption among marquee web sites will really scale.