A lot of things could happen, doesn't mean it will happen, or it should happen.=Some cities will be banning all diesels in a few years, even if some are very clean now. The same could happen to SUVs.
It seems London will not be exempting hybrid cars from congestion charge anymore, so that means there will be basically no SUVs driving there for free, as Uber and minicabs would also be charged.
More on topic with the thread, I think over the next two decades, autonomous cars will become more mainstream. After the honeymoon phase, there will be a rise of accidents involving autonomous cars, which will lead to calls of banning them, which probably won't happen.
Overtime, people, roads, and road conditions will adapt to fit autonomous driving, they will become the norm, and overall accidents will decrease. As more autonomous vehicles replace traditional ones, accidents will further decrease. This would include pedestrian related ones.
So, maybe by the time cities get around to banning SUVs, there will be no need to.