That's applying technology to a, fundamentally, people problem and it may not yield predictable results. Such solutions aren't going to appeal to the vast majority of non-tech savvy people (and hosted solutions are arbitrary at best, censorship-inclined at worst) therefore will not make a dent in the actual proliferation of "crapware".
In short, anything that requires more effort than is necessary to install crapware, will not see adoption rates higher than the crapware itself.
I think that there will be a home hub, a technology helper, supplemented from the cloud, but anchored to the family home network point, that is the natural place to deliver a wide variety of services, digital backup, net nanny, finacnes fridges etc.
Make something the gateway to the house and that something will be defended by house owners as much as the physical house itself - it becomes the virtual avatar for the house.
In short, anything that requires more effort than is necessary to install crapware, will not see adoption rates higher than the crapware itself.
We need something else.