The vast majority of users don't accumulate 5 answers in any one tag.
Of those that do, a small percentage will care enough about that tag to curate it.
Q: How many users does it take to make a synonym? A: 5. 1 to suggest it and 4 to vote. A: 2. 1 to suggest it and a moderator.
Let's be generous and say that 5% of users eligible to vote on synonyms actually find their way to the page and vote. That means critical mass needed to set off a synonym reaction is 100 users with score of 5 or more in a given tag, all active at the same point in time.
Low-volume tags like
websphere-mq are by definition specialty tags. Aren't these often where synonyms are needed the most? For example,
websphere-mq posts are split between that tag,
mqseries which is the former name and
ibm-mq. The tags would be much more useful if they all consolidated to
websphere-mq but without intervention, it will take forever. Literally.
So how about a "Flag for moderator" function for synonym suggestions? It would be OK if the function didn't appear until the suggestion had aged a while or if the number of eligible users was below a threshold.