Money is driving realignment. Doesn't seem like there is much incremental $ for Big10 to add Iowa State when they already have Iowa. IMO we have a small chance at the SEC if they have an eye on new westward markets.
But I think the SEC's main westward targets would be high DMA's like Phoenix (#11), Denver (#16), Portland (#21), Salt Lake (#30) or Kansas City (#34). And then eastward: NC (#10 Charlotte & Raleigh), Miami (#18). Throw in a GA Tech & Clemson for good measure and the SEC can easily get to 24. As we have seen in realignment, having solid sports programs is secondary to eyeballs (carriage fees) for BTN & SECN.