What benchmarks or useful signs can be found to declassify neologisms? Obviously, inclusion in a dictionary is as likely as anything to declare a neologism a word but what happens just before that point?
Note that I am not asking how long it takes to convert a neologism. I am asking if there are there any good indications of neologisms about to phase into the lexicon.
The flip side is also interesting: When is it safe to say that a neologism is not likely to catch on without some drastic intervention? For instance, kipple is an interesting word with a distinct meaning but it seems so far outside of the cultural sphere that it seems safe to claim it will never become a recognized word.
I suspect that answers to the first part (what makes a neologism stick) are likely to answer the second part via absence. As in, if a certain thing is a good sign for a neologism, its absence is evidence against the neologism.
Best Answer
Neologisms can be divided in three categories/phases:
Anyway, although we can say that when a word goes inside the Dictionaries, it is not a neologism anymore, if it's being used so commonly and widely, it will be considered a normal word like others, and this is what counts.
Sometimes, even when experts or linguists don't agree on some neologism, for various reasons, what really matters is the common usage and the acceptance by the public audience, as you could also see from the three categories/phases I wrote above.
If the event/situation the neologism describes cease to exist, the word will stop being used and therefore disappear. This is to answer to your second question.