[bpeebles]

It's not always clear but notability is not temporary[0] under English Wikipedia's guidelines. Standards of what makes something notable have shifted over the years and sometimes the different is hard to tease out.

0. https://en.wikipedia.org/wiki/Wikipedia:Notability#Notabilit...

[i80and]

I understand this to be the case, but in practice the distinction is mostly immaterial. Topics are notable for a decade, then not notable the next.