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Unlikely. It's pretty standard fare in the WWE for top level faces to attack anyone who gets in their way, regardless of whether or not that person is a face or heel. It's doubly true as we approach the Elimination Chamber, where it's in Randy's best interests to have his opponents as weak as possible on the way there. An RKO to Khali certainly serves that interest. Big Show and Orton's little spat is probably more indicative of Show turning heel to set up the Shaq match rather than Orton turning heel himself. Reading the recent actions and interactions of Randy Orton as a prelude to a heel turn is probably a mistake.
As for whether or not it should happen, like so much of the near future of the WWE, this depends entirely on whether or not John Cena turns heel at WrestleMania. Certainly the face/heel dynamic of the WWE could not possibly sustain both Orton and Cena being heels at the same time. The WWE does seem to lack something in the way of main event heels at the moment, however, with Jericho being the best they've got. Henry being injured (and unlikely to sustain his time in the main event after his return, if recent history is any indication) and Bryan's success as a main event heel uncertain for the time being, one does feel a certain dearth of main event heels. Supposing Cena remains a face, there's an argument to be had for Orton turning heel and perhaps reprising his feud on with CM Punk on SmackDown in 2012. I prefer the alternative of elevating some of the very good upper-midcard heels that are about now - Rhodes, Barrett - but still, one might make the argument.