Obsolescence (bs l s( )ns), noun;
The state, process, or condition of being or becoming obsolete.
Obsolescence entered English in the 1820s from the Latin obsolescere meaning "to fall into disuse."
In the case of The Who, as Townshend observes, that meant exploring the genre's built-in obsolescence. At the start of the group's career, he notes, everyone believed that pop music was going through phases, none of which would last long.
?"Lambert & Stamp: The men who made The Who," BBC, May 15, 2015
"We'll give him a good trade-in on his old one, allowing for depreciation and obsolescence. What model has he got?
?"Philip K. Dick, "Foster, You're Dead," Star Science Fiction Stories, No. 3, 1955