SHould we worry?
One year (and a little more) ago people came here
- because the crypto market was rising extremely fast and they were hoping for some quick bucks.
- because their transactions were not getting confirmed and to seek for help
- ICOs were still a thing and many came for bounties
- many were here to spam for ranking up, then join bounties or sell accounts - merit system have solved that.
As you can see there were plenty of reasons for more and more people come here. And most of those reasons are not here anymore.
So a "decline" is normal. I don't think that they were significant for the money flow in crypto markets, so at least that's not a reason I'd be worried about.