We need an airdrop to stimulate things on the waves platform, maybe to celebrate the release of the Client 1.0.0.
But why do you think that an airdrop will stimulate anything right now? Its giving away resources for free and who knows if anybody really becomes more active only because of an airdrop.
In fact waves just need adoption not airdrops lol. It will come with smart contracts on main net, I'm pretty sure.
And speaking about prices, every altcoin is going/went down, it's just the market right now! ICO price was around $0.19 btw