I think people generally have the wrong approach to framing consumption. Consumption should not be the goal of a government, the ultimate goal should be to improve the living conditions of your population. Suburbanization has not necessarily done that in the US since it created car dependence and subsequently large amounts of traffic, produces a lot of maintenance and energy burdens which could be more efficiently managed in an apartment building (apartments use around half the amount of power per unit of floor space). It also moves people a larger distance away from essential services. Of course this will increase GDP, but increasing the GDP shouldn't be the goal if it doesn't improve people's livelihoods.
The things China should focus on is improving productivity and distributing resources created through productivity improvements more equitably, burdening households with additional costs related to housing would increase GDP, reduce households savings, and possibly spur job creation but not necessarily improve living conditions for the average person.
Having a large house & yard, being surrounded by nature, and substantial distance from your neighbors is, at least to many if not most people, a "living condition" improvement. It was and still is one of the stronger incentives for emigration.
Added consumption is just a bonus, in this regard.
Packing everyone into concrete apartments in dense cities doesn't necessarily improve their quality of life. If anything, there's a significant chance it'd reduce it, even if it is more convenient by some measures.
Again, if given the option - what would Chinese people
prefer? That's the final say on the matter.
And it's not like this necessarily has to come at the cost of lower productivity. Efficient transportation can go a long way to reducing the congestion caused by poor civil planning in the US. China also has
plenty of
space - it just has to be made fit for human habitation and employment.