The amount of CGI needed would bankrupt many studios.
That's just the tip of the iceberg, though. As you might recall, Tarantino's movie Inglourious Basterds ends with the slightly unrealistic scene where Hitler is gunned to shit by a group of Nazi-hunting American Jews in 1944, rather than killing himself in his bunker the following year. If you ever wondered what the world would be like if World War II had really ended that way -- well, it turns out Tarantino has been showing us that reality for the past 20 years.
You see, in Inglourious Basterds, Eli Roth plays a character called Donny "The Bear Jew" Donowitz.
And in True Romance (written by Tarantino), there's a film producer called Lee Donowitz, who has been confirmed to be Donny's son. One of the main characters in True Romance is a woman called Alabama -- the same Alabama Mr. White mentions as a former partner in Reservoir Dogs. Since we've already linked Reservoir Dogs to Pulp Fiction, this means that almost every movie Tarantino has done is set in the Inglourious Basterds timeline. We could go even further and link all the rest through Tarantino's fake brands, like those Red Apple cigarettes that appear in a lot of his movies (including Kill Bill).
One kills hundreds of people over the course of the films; the other is Uma Thurman.
It makes a sort of sense when you think about it -- the world would be a very different place if Inglourious Basterds was historically accurate and everyone knew that the Nazis were defeated not through strategy and air power, but by sending a handful of pissed-off guys to do this: