I have to say all this recent talk of the death of grime seems mightily over-zealous.
If we look at history there needs to be something that fills the void. Jungle had UK Garage, UKG had Grime. People don’t just switch off their pcs and stereos and create a vacuum. At the moment nothing has appeared that seems to be able to maintain the continuum successfully. Please dont say Funky House (or even 'dirtypop') There would need to be something that could successfully replace the masculine tone of grime. Uk Garage successfully managed to meld both the masculine and feminine and replace Jungle, but music production is a mans game even if the pendulum may swing into the feminine now and again.
If we look at history again we see the manufacturing of scenes to be a dismal affair (see: 'urban house... pleaseplease don't mention grindie.) The renaming of a genre is entirely possible, if the makings of scene have already blossomed (dark 2-step Garage=dubstep.)
UK Garage apparently 'died' in 2002 but coming back to the South of England I have been greeted with non-stop UK Garage on my local pirate (freeze fm) and countless nights. No trend really dies, it just evolves.
Lastly Grime has operated since its inception under the fact that there is next to no financial input or economic gain to be had from its 'industry'. Acid House to UK Garage had a financial infrastructure that it relied on. Take that away and it becomes detrimental. Grime has operated since its inception with little to no reliance on finance, partially due to its ability to operate in the virtual, that is the un-regimented and democratic realms of cyberspace. If record shop closes, it's no skin off of grimes back (watch out for server crashes however.) You just a willing kid/MC/producer (creates the mode) need pirate copies of fruity, (method) and a radioshow or a forum. (medium) Taking personal taste into account is irrelevant.
To 'kill' the genre, Grime you would have to replace it with something else.