They keep working and releasing new developments, DeepSend may be around the corner, they're just waiting to get rid of weak hands selling onions almost for free and reversal in the general market sentiment, then I'm confident it will boom.
Why would anyone with a sane mind choose Onion over other privacy coins like Monero and Zcash, for example, for anon payments? Heck, as soon as the airdrop was done I don't even see twitter shills anymore, now there's another privacy coin being airdropped (prvacy or something like that), which will eventually die after the airdrop