Avira > What about just using it for business and not having it at home at all,
I think it is fair if this works for you. I do prefer to work from home as much as I can, so that I can model (hopefully) proper behaviors to kids and also learn with them. And I had to deal with some inappropriate internet usage with older kids, so was thinking for a time to go the way you describe, but it evened out and younger ones do not seem to have these issues, bli ayn hara, maybe because they see the older ones.
The downside of your approach is lack of proficiency in skills that their generation will be using. Internet is not like TV that will quickly go away, it has sufficient positive content. At some point, humanity, and Yidden in particular, will figure out how to filter out the wrong parts. Maybe, we can re-use Chinese firewall software, I hear it works to keep 1 bln people under control ..
So, I don’t want the kids to start typing with one finger when they are 20 and not being able to distinguish between a research paper and a facebook post. So, this is not just part of the mitzva of giving them a job skill, but also of teaching them swimming (in life).