There is no overt pushback. That doesn't mean that there is none. And the presence and activity of the usual environmental NIMBY organisations like Deutsche Umwelthilfe, NABU, BUND, etc. point to at least some covert opposition, since those organisations happily serve as fronts for non-environmental interests.

And state politics, especially in the east, is rife with people using it as a stepping stone to the federal level. Famously there once were more prime ministers from the west governing the east than eastern-born ones.