There's still a place for pushrod (OHV) motors in the automotive world...GM has shown that with their LSx series of V8's. OHV engines run fine at lower RPM's and can be tuned to produce great low-end torque. That's great for trucks and also great for muscle cars and pony cars too. I'm not sure why Ford, Toyota, and Nissan decided to produce OHC truck motors...
The Essex V6 family would have been great as OHC engines, but would have been w-i-d-e as they are a 90 degree block. That's one place that the Cologne motor has an advantage with its 60 degree block.
I think that all of GM's new OHC V6's are 60 degree designs also.
Traditionally OHC engine designs have been reserved for high-RPM, low(er) torque needs (think light weight sports cars). The playing field can be leveled with turbo or supercharging or with multi-valve OHV designs. Ever seen the Arao 4 valve OHV Ford head?