There Will Be Blood won two Academy Awards, including one for Best Actor. Paul Thomas Anderson was nominated for Best Director but lost to the Coen Brothers for No Country for Old Men (for which we have a sitcom idea). It is a long movie and the ending seemed conclusive. But we are not finished even if the character (Daniel Plainview) thinks he is. There will be Blood means There will be a Sequel.
Daniel Day-Lewis probably won’t do it. We can get Robert Davi or Christopher McDonald to replace him. They are better actors anyway (or at least better with a bowling ball).

Luckily, we won’t need Paul Dano unless Paul Sunday’s return is pitched. The sequel to There Will Be Blood. Our title is There Will Be Milkshake. Daniel Plainview makes a milkshake from Eli Sunday and calls it an ‘Eli Sundae’ and becomes successful. Plainview then regains his competitive edge to corner this new market and adopts a new son. 

The critics never realised how funny the first film was. Throwing bowling balls at Eli and bashing him with a bowling pin felt like a scene lifted from Irish comedy Father Ted.