When to sunset your blog

In reality, what really happens is you write a few posts for the first month or two, maybe add in a couple shares, that dwindles to a post a month, and then after a year blogging it seems like just another item on your ever-growing to-do list that is put off indefinitely. Months go by and the best you can wrangle up is a retweet of an interesting news story you saw on Yahoo.com.