FH success mostly helps BFR in regards to operating a ton of engines simultaneously (27 for Heavy, 31 for BFR) and in operating heavy lift capacity rockets in g

FH success mostly helps BFR in regards to operating a ton of engines simultaneously (27 for Heavy, 31 for BFR) and in operating heavy lift capacity rockets in general. BFR/BFS will come online as a self-competitive offering from SpaceX initially and both lines will be out in the market together (BFR vs. F9/FH). If and when BFR attains sufficient maturity, reliability, and market trust then the Falcon line of rockets will be phased out. BFR will have much greater capabilities (higher payloads, etc.) but will be substantially cheaper because it'll be 100% reusable and the reusability longevity for its parts will be much higher than for F9/FH, so there won't really be much reason to keep Falcon 9 or Falcon Heavy around.