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As for pushrods vs DOHC, I happen to like both and IMO each has actual advantages.
I like the DOHC/4-valve design because it allows for greater valve area (high airflow and without klling velocity....score), great peak power numbers, and it also solves the valve float problem pushrod engines exhibit which don't require 20,000 rpms to appear.
I like the pushrod because it's compact, naturally torquey, and relatively inexpensive.
I don't expect either to become obsolete anytime soon unless the government gets really stupid with emissions requirements which could hurt the pushrod design more. And to be honest, if that happens, the horsepower wars are very much over anyway.
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