As I've said to others: Why not both?

• Cleaning up the MFL isn't a billion dollars, it's more about optimizing what already exists to complete the goal.
• Extending the BSL to the Navy Yard is still doable, and should be done, but in the meantime we can also optimize the shuttle buses that run at the end of the line to run at least at the same pace as the Subways do.
• The other projects, like the trolley modernization, are either already underway or also require the City of Philadelphia and most likely the State to approve new ways to use the road and allow for a dedicated lane only for the trolley. It's doable, of course, but takes time.
• The PATCO extension isn't SEPTA, it's... PATCO.

This doesn't mean we shouldn't try and make those things happen, but there IS funding for the subway if SEPTA de-prioritizes the KoP Extension. Same with at least trying to get a BSL extension to the Navy Yard.