Here's a link:
RPGnet News
No. WotC referenced market research done prior to the release of 3e.
This article says absolutely nothing about how long-run an OSG campaign were likely to go.
The table you included...
says the following:
1. Players ("newbies") who have been in the game a year or less are likely to play shorter sessions, have smaller groups, and will "restart" with new characters more quickly. (Logical: TPKs, players exploring new PC options/builds, etc.)
2. Players ("experienced") who are 1-5 years involved increase their chances of longer sessions, larger groups, and more time before a "restart".
3. Players ("veterans") with 5+ years are the most likely to have long sessions, larger groups, and much longer between restarts. Remember also that although sessions are likely longer, veterans aren't as likely to have as frequent play.
Now, if there is anything else I've overlooked, let me know, but frankly I see nothing in that article to support any such claims. Otherwise, I'll not dispute anecdotal evidence---everyone has their own.
While it may be ancedotal, it matches with mine and the research WOTC did at one point. Even campaigns lasting two years were very much an outlier.
(There were some weird cases back when I started where the meaning of "campaign" was hard to pin down since people and characters cycled in and out a lot. Some of those went on a long time.)
Sure, I'll accept and take anecdotal all day long... I know my personal experience is not likely the same as most others, but I've also met a lot of gamers who've also enjoyed many long-run campaign, spanning 2+ years (and often decades long---lucky punks!

).
Just a purely anecdotal side note, back in the 80's even groups that played D&D would often rotate them with other game systems so that the constant ongoing campaign wasn't a thing because people would want to move on to something else. Among other things, the allergy to learning more than one game system didn't seem as common as it appears to be now.
Yeah, we played D&D 80+% of the time, but WEG SW, Vampire, Shadowrun, GURPS, and others were tossed in from time to time. Then when MtG came out, we incorporated playing that when we felt like a "break" from D&D in the 90's.