Except they said they're making a sequel while acknowledging the disappointing sales. Dead Space didn't light the world on fire either.

An iPod/iPhone version of Mirror's Edge came out last month. A Mac version is supposed to be coming out later this year. They have not dropped the franchise and are trying keeping it alive.

It just takes time. But it's a good idea to not get your hopes up for things in general if you don't like to be disappointed.