Idea would make sense, Boston is an AFC market, not NFC.
Same factor that caused WJW In Cleveland NOT to be purchased by Fox (they're still an affiliate). AND the purchase of KCPQ (Ch 13, Seattle, An NFC Market since 2002) FOX bought KCPQ when the Seahawks moved to the NFC.
I also wonder why FOX never decided to Ditch WFLD in Chicagoland in 1994 (and ever since then), for WGN (Ch 9), thanks to the NFC package going to FOX, which includes the Chicago Bears.
Houston is way too big not to have all of the big 4 be networked owned. I can understand WFAA in DFWD not being network owned, due to their longtime ownership line (Belo, Gannett, Tegna)