Wow! You increased the WAF by using 7 speakers.
Actually, the set-up you suggest sounds reasonable so long as there is nothing between the Odysseys (e.g., gear racks) and they are still away from the walls, and it sounds like they are. The soundstage may suffer a bit from having another set of speakers so close in, but you can check the effects of this by simply moving the Scenario's away (e.g., 5 feet or so) and see if there is any noticeable difference while listening to the Odysseys. If the speakers sound much better to you without the Scenario's nearby, consider having some easy way to move the Scenario's back and forth as needed for movies.
My first thought was that you should simply try HT on a stereo setup, but that big screen would force you to move the Odysseys only about 3 feet from the wall. That could also damage the soundstage and imaging. But, sometimes it doesn't seem to matter much and you might also want to experiement with that. If the Odysseys sound just fine in a position that allows you to utililize your screen without moving the speakers, you might want to sell the Scenarios and buy your wife a nice gift (hey, maybe there'll be something left over for that upgrade you've always wanted). You could still use the center and rears with the Odysseys, but you may also get away with just using a pure stereo mode. Experiment and trust your ears.
Actually, the set-up you suggest sounds reasonable so long as there is nothing between the Odysseys (e.g., gear racks) and they are still away from the walls, and it sounds like they are. The soundstage may suffer a bit from having another set of speakers so close in, but you can check the effects of this by simply moving the Scenario's away (e.g., 5 feet or so) and see if there is any noticeable difference while listening to the Odysseys. If the speakers sound much better to you without the Scenario's nearby, consider having some easy way to move the Scenario's back and forth as needed for movies.
My first thought was that you should simply try HT on a stereo setup, but that big screen would force you to move the Odysseys only about 3 feet from the wall. That could also damage the soundstage and imaging. But, sometimes it doesn't seem to matter much and you might also want to experiement with that. If the Odysseys sound just fine in a position that allows you to utililize your screen without moving the speakers, you might want to sell the Scenarios and buy your wife a nice gift (hey, maybe there'll be something left over for that upgrade you've always wanted). You could still use the center and rears with the Odysseys, but you may also get away with just using a pure stereo mode. Experiment and trust your ears.