They are definitely feeling pressure as users are demanding and expecting more from their communication tools. Slack's done a good job at bringing more to the table, but we're really just at the start of a renaissance in business communication.
If you think about "chat" in generations, you started with IRC, AIM (which is still used in many companies) and then came HipChat. Not much development there for a couple years so Slack put some lipstick on the last generation of chat product. There's a whole new class of communication platforms being developed now that are taking things even further, by enabling true cross-company communication (meaning both internal & external), things like customer support integrated with internal team communication, etc.
If you think about "chat" in generations, you started with IRC, AIM (which is still used in many companies) and then came HipChat. Not much development there for a couple years so Slack put some lipstick on the last generation of chat product. There's a whole new class of communication platforms being developed now that are taking things even further, by enabling true cross-company communication (meaning both internal & external), things like customer support integrated with internal team communication, etc.