Earlier quoted context omitted.
Exactly. What does "several" mean? Are we talking two years? Five? A decade? Until jQuery changes their minds?
How relevant will IE8 be in just two years, though? If it's 3-5 which is what it sounds like, then that's just more of a nail in the coffin for IE8 support.
That very much depends on your target audience.
For home users IE8 is pretty much dead already, the only subset of people stuck there are the few who are using XP and have not switched to Firefox/Chrome/other. As more and more game-y things on the web start demanding newer features rather than creating/using/supporting fallback options for IE8 (canvas in particular).
In more corporate environments, IE8 is often still king and will be for several years. Most of the clients for the product I spend most of the working day panel beating are large banks and most of them have only just migrated to IE8 from IE6 because they have to soon (IE6 falls out of extended support in less than 12 months, along with XP+sp3). If they follow the same pattern (and I see little reason why they won't, slow moving mammoths that they are) I and many others will have to be concerned about IE8 until at least 2018 as IE8 falls out of extended support in 2020 (as it's support windows are tied to Windows 7's). Hopefully jQuery's idea of "several years" is as least as long as this.