> Two things become clear with this chart... Second, the trend is downward
Um... No. The "trend" is due to the fact we don't know the future.
Seriously, it takes about 7-10 years for a OS project to take off, so you won't be seeing the 10 year replacements for proprietary software from 5 years ago.
The "trend" looks like more of a random distribution which narrows as it gets closer to the present.
There's a graph further down about this point. Both the minimum and the maximum appear to be dropping. Though especially with the minimum there might be recency bias at play here. It's not exactly a random sample of software we're looking at.
Um... No. The "trend" is due to the fact we don't know the future.
Seriously, it takes about 7-10 years for a OS project to take off, so you won't be seeing the 10 year replacements for proprietary software from 5 years ago.
The "trend" looks like more of a random distribution which narrows as it gets closer to the present.