Grime isn't dead just evolving once more. I hear it merging alot more with Garage at the moment. Royal T's productions, some of DJ Qs new ones and a whole load of new breed producers coming through are just blurring grime with other music. MC wise, not many I'm feeling at the moment.
Grime has definitely lost its hype (which peaked around 2008) but that doesn't mean its dead.
Listen to instrumentals by Preditah and Kahn. Good stuff.
as for MC's I couldn't really give a fuck. The main thing that that annoys me about Grime is that it will always constantly be mistaked for UK hip hop, when in fact its much more closer to Garage and Dubstep