"Do you see the benefit in creating a Dazah app that's targeted towards DaniWeb users?"
OK, that took some thinking. To me, DaniWeb is the Dazah app for DaniWeb users. We already have direct messaging and if someone needs to go beyond that, we have (heresy?) other ways to commincate. For this reason the chat app may not fit well in the DaniWeb as I perceive it user base. You could poll the users you have to see what they think about this.
All that aside I'm getting less and less hits on programming forums in general with Google. It's clear the search engine is changing towards something else. And I can see why. Take a random collection of people like you scoop up in say Soylent Green and what percentage are programming, programmers and the like? I'm sure you know this number. So does Google. So to leverage your userbase information you have to tackle what they want which is tough since well, here we are.
Is it true that 1 in 3 hits are from a certain country now? Maybe you need a Dazah with leaders for them?