Hopefully we wouldn't have! I'd rather have had more intact city cores and fewer drivers.
Probably my major objection to the system, urban freeways, didn't have to be part of the system, and Eisenhower apparently personally did not want them to be, see http://www.fhwa.dot.gov/interstate/faq.htm#question23a Having destructive elements added to a giant plan usually seems to come with selling it though.
The German energy plan described in the article I'd bet involves a lot of tradeoffs to get support from various players. It sounds way riskier than say just more massively taxing carbon emissions and subsidizing energy R&D. But presumably those aren't politically feasible.
Another political infeasibility (I'd guess) that surely has been suggested elsewhere: Germans should instead get a large % of solar energy (or derived revenues) produced in southern Europe to pay for bailouts. This would also mean solar panels deployed more effectively, and local Greek, etc, labor employed for installation.