I know it's the same for some other devs, as well. A good number of us are sticking around, at least supporting and fixing bugs on our apps, and creating new ones.
The ecosystem is definitely not dead yet, but we can only run on fumes for so long. If they get a hardware parter and new hardware that people lust for (imagine webOS on the likes of a Nexus S or Galaxy S II), we might be OK.
EDIT: Also, I should mention, many devs received loads of downloads over the weekend, myself included. http://www.webosroundup.com/2011/08/devs-see-boost-to-app-do...
There's no new tablet hardware available, which limits growth on how many new developers can pick up a device and start developing against it.
The current influx of new users are sub-optimal customers compared to other platforms. They're either bargain hunters or gadget geeks that picked it up as a tertiary device.