I spent two years of my life focusing on chat and I think it's matured to the point of oversaturation in todays market.

Chat itself should now be viewed as a commodity, it's the features that's built on top of it that will differentiate one platform over the other.

Enterprise chat used to be a differentiator, but everyones doing that now too.

I think document sharing (Dropbox, Google Drive) and chat are basically in the same place right now in that both have been democratized and both have an over saturation of similar services.