No need to redo the origin, but like SV's "new power" episodes, there's more appeal in scenes of discovery (usually associated with origin stories) and showing real world reactions to fantastical events ("money" shots). In fact, it was Scott's first vague descriptions of SR over at BT's that appealed to me the most because I *thought* that's what we were getting: what would happen in the real world if a flying man wearing a colorful costume just showed up one day and started saving lives? How would people react?
This is not something we'll see play out in SV due to the nature of the show, but it's PERFECT [for a DTV film]. Jonathan is already dead, so we can't unring that bell, but the FOS is in place and so are the interpersonal relationships among a previously established full cast (Lex, Lois, Perry, Jimmy, etc.) Action could pick up basically wherever SV ends - presumably with Clark donning the suit in Metropolis and having already assumed a mild-mannered (quirky?) MCK disguise. The plot would NOT require that audiences see the show in order to understand what's going on. For example, Lois' crush on Superman is obvious - what woman wouldn't go all ga ga over that? But Clark's secret attraction to Lois is a much deeper thing. That would have already been explored in the series [currently in S6 progress.]
Another alternative ... would be to show Clark in world-travel mode ala Birthright, and have him end up in Metropolis by the end of the first act. Regardless, a SV [DTV] should be a self-contained [story] ABOUT Superman...
...These are the sorts of things that make origin stories so compelling, and it's why SV fans want to see "their" gang continue into the future. SV is its own origin and continues to adapt the mythos in unique and entertaining ways. Why stop now?
http://www.superherohype.com/forums/showpost.php?p=9486370&postcount=118