Warning! SPOILERS ahead for the Blue Bloods series finale.After Blue Bloods‘ finale, there is one last storyline that the show never took the chance to explore. Led by Donnie Wahlberg (Danny), Tom Selleck (Frank), and a wide array of other stars, the show ran for 14 seasons, before it ended due to the excessive budget. While viewers have been campaigning for another season, the show’s final episode aired on December 13 and saw the end of the Reagan family story. Even if a spin-off is eventually greenlit, Frank Reagan is unlikely to appear consistently, given existing salary issues. His story will end with that final family dinner.

https://screenrant.com/blue-bloods-series-ending-frank-reagan-no-romantic-partner-kevin-wade-explained/