Did you include repair ingress in that? My previous 2 months were roughly 1.2TB and 0.8TB, so 1TB seemed fair.
It’ll take a lot longer than 2 years to get to the theoretical limit of 40TB (technically never, but after 10 years you’re still at 38TB). With the current traffic I would advise not to go over 24TB as that already takes 3 years to fill up. By that time you can always decide to expand then. Funny enough this matches with the Storj recommendation of having nodes between 8TB and 24TB in size. Turns out that was pretty good advise.
I would say, don’t count on it. While by that time there may be many more customers, there will also be many more nodes. Looking at the future based on what we know now, I actually don’t expect nodes will get it much better than they have it today. But I’d like to state that that is mostly educated speculation. While the sheet is based on actual current network performance. So I should probably stick with what we actually know.