The blog becomes a checkmark on somebody's quarterly report: "Blog created."
Why are you so upset about it?, you may ask, O my faithful reader, and you'd be right to ask. It's not like a dormant blog is actually suffering, or causing harm to anyone. Or is it?
A blog, just like your Twitter account, or your Facebook or Google+ page is not a one-time thing, it's a commitment. Much like you commit to walk a dog and clean up after it, you commit to run your social media channel. It's not something you GET, it's something you GET INTO, and have to take care of continuously.
A dormant blog, should your audience stumble upon it by accident, well after you have all but forgotten it existed, will harm you by making you look like you are not doing your job. Which quite honestly, you aren't. If the last post on your blog was made half a year ago, and your Twitter account has three tweets in it, all from more than last month, your social media presence looks kind of like this:
And this sort of thing does not impress your audience. And if you forget, the "audience" are those potential customers who you as a marketing professional are supposed to impress.
So next time you want to go all "social-media" on your audience, think. Do you have the resources and the commitment to take care of these new outlets in addition to all the other stuff that you do?
If the answer is no, figure out whether these new channels will be more effective than something you are currently doing, which you can now drop in favour of your social media involvement.
Go stalk someone who's successfully using social channels. Maybe they work in a different department, or even at a different company. Spend a few hours to click around and see just how much social media output they are producing. Can you match that effort? Can you do at least half that?
If the answer is no, go see if you can hire an intern. No, in all likelihood they won't create anything as effective and powerful as a full-time professional who is well-fed and has some level of relevant industry experience. But this is the absolute least you should do if you are dying to get into social media.
If you can't even afford a starving student to tweet for you part-time, and you don't want to do it yourself, drop it.
Put that idea on the ground slowly, and back away. No sudden moves.
Now, just. Walk. Away.