Buildings will get so large that they are act as their own cities, creating space that can be returned to ecological use. Such buildings would be so large as to need their own rail systems.
But the problem is living spaces being separate from working spaces. I do hope that buildings like this get closely integrated into mass transportation. Not every couple work at the same place with their kids at the corporate school. If public transportation is not very intelligently integrated, the desolation of the parking lots that this beautiful building replaces will continue in the social dimension. From the presentation it seems as if this will be addressed by buses.
You do realize that what you're positing (giant work buildings, close together, with all needed facilities nearby and lots of intra- and extra- transit access to nearby housing) is what most of us call an "urban downtown area", right?
You don't need to invent this. People already figured it out.
I often wish someone had taken his real dream (a closely knit city of work, living, and play areas that always worked towards the future rather than a lame [by comparison to what it should have been] theme park) and run with it.
Some companies have closely integrated living and working.
Foxconn is one such company.
(some have suggested that Foxconn employee depression problems may be partly due to the employees living away from their friends and families, often at a considerable distance)