I dunno, I'm a bit skeptical about the lack of mainstream grime coverage hindering the genre's progress all that much. Actually i'm pretty sure bemoaning a lack of broadsheet articles is putting the cart before the horse and reflects the critic-centric mindset of a lot of people here. Does London really need any more magazine articles? If I type "grime" into google it takes me about 2 seconds to find more internet grime coverage than I can shake a stick at. The genre's been around for a few years, anyone with even the slightest interest in it and knows what it's called can track down about a million sources of information on it.
I think the lack of grassroots promo options is more pressing; ie lack of radio shows and live events. Grime artists have to do more to convince London (and England's) black music fans that their scene is good enough to get behind.
The widespread perception amongst a lot of black music afficionados in London is that grime is for little kids. Not even, say, college age kids. Little hype yutes. On one video shoot i was working on one of our runners was making fun of this 20 year old girl for being into grime, saying she should "grow up, leave that shit behind". 20 years old! For whatever reason, I dunno if it's the conduct of the MC's, the production values, the songs, the lyrics, a lack of mystique about the artists, whatever it is, something is keeping grime from achieving its potential as the voice of the streets.
And the people who should be helping artists out, bringing them up, grooming them etc. are shutting the door (e.g. the major pirates purging grime a couple years back). Compare this with indie rock where you have the same saddos who played in bands in the 80's working away behind the scenes on some svengali shit trying to engineer the next big thing.