I Shaw am.
It's a tough call, though, deciding between defending existing usage and
embracing a neologism. My (probably not terribly consistent) take is
that existing usage should be preserved where it maintains a clear
distinction, and neologisms should be welcomed if there is no word or
phrase doing the same job with not great loss of felicity.
For the former I dislike the americanism which uses alternate as a
synonym for alternative, as I believe the two words do different, and
equally useful, jobs, and to lose one diminishes the language. I used to
think the same about the confusion of less and fewer until I realised
that there are very few, possibly no, cases where the distinction
between a reduction in the countable or the continuous versions of a
noun would be important. And we don't make the same distinction for
increases. Recognising that has reduced my stress levels in supermarkets
considerably.
In the case above "made obsolescent" is barely longer than and arguably
more mellifluous than "obsolesced" that I do not consider the neologism
warranted. But beyond that the introduction of such a word makes me
wonder if the author really meant "made obsolescent" or "made obsolete".
Logically what was written means the former, but it's not impossible
that the latter was intended.
john
john