Has anyone completed BioShock Infinite and the entire Dark Tower series? Has anyone read into the many similarities as how the dark tower and the lighthouse serve as linchpins to connecting many universes?
There are some similarities, and other people have made the connection too, as you can see by googling.
However, while BioShock's Creative Director Ken Levine is an "old school King fan", he never got into The Dark Tower, so any similarities are probably unintentional.
Levine does say in an interview that Stephen King's non-fiction book On Writing was an inspiration on how he wrote the game's story:
Gillen: I suppose what I was getting at was what books should people read if they want to follow your thinking?
Levine: Have you read Stephen King’s book On Writing?
He might have been aware of the ending to The Dark Tower through his love for King, but it doesn't seem to have been direct.