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.