Classic FUD around the internet, 1 TB of plots gives you 10 months expected time to win currently.
Regarding the calculation and estimation: "Actual results may take 3 to 4 times longer than this estimate."
So 10 months to 3 years to win one single block which will give you 2 XCH. Considering the total network space rising at the rate we're seeing I think we should review this calculation again in a week.