Emtek, the company that runs bbm for consumers now says it is shutting down the service as of may 31st. I'm one of those people who still use it daily, although that's more out of habit than anything else.
When it first came out it was amazing. I think back in 2009 or so a group of coworkers started using it for project collaboration and it was awesome.
I don't think I'll have any issues using whatsapp from now on, as I am already familiar with it, but BBM will be missed.