cogs in the gentrification machine

As Adam said in his reading response, and in summation of Howell's piece, skateboarders and other "lower creatives" are just pieces in the machine that is gentrification. This to me is interesting, first and foremost because those are exactly the type of people (along with the homeless population) who the general populace bemoan, but also the ones who the flip side of the coin argue for. One side says they are a nuisance, the other said they are necessary for the freedom and openness of public space. Again, it seems this issue of inevitability keeps coming up - the fact that once the wheels for gentrification are set in motion, the inevitable always happens. First the homeless, then the "shock" wave of skateboarders, then the creatives, then artists, and so on. So is the argument for or against these populations just moot?