Tarantino's movie would have cost 99 million in 2023 dollars. Saving Private Ryan had the same budget with Basterds (70 million, only ten years earlier, meaning almost 133 million in 2023 dollars. The Fugitive cost 93 million in 2023 dollars. For comparison, 1989 Batman cost 117 million 2023 dollars (ballooned from an initial budget of 73 million, due in part to the 1988 Writer's strike). Jurassic Park also cost nearly 133 million in 2023 dollars. It's still not 340 million, of course, but we still need to take inflation into consideration, since most of these films are older and you're making a direct comparison.

Having said all that, take a look at the Golden Globe nominees this year:

Drama

Oppenheimer (winner): 100 million

Killers of the Flower Moon: 200 million (not a superhero/action flick)

Maestro: about 80 million

Anatomy of a Fall (France): 6.7 million

Past Lives: 12 million

The Zone of Interest (Poland): around 15 million

Comedy/Musical

Poor Things (winner): 35 million

Air: 70-90 million

American Fiction: around 20-25 million

Barbie: 145 million

The Holdovers: around 70 million

May December: 20 million

This is just an indication, but you will see that the outliers (in bold) are just that: outliers, and still quite a bit distant from the enormous budgets of action blockbusters. However, even the spectacular Dune movie cost 165 million, while its (seemingly) even more epic sequel will cost 122 million. Therefore, we can surmise that it's quite possible to make epic sci-fi films on much less than the indeed ludicrous 340 million budget of Fast X, while it's also possible for largely slow and artistic movies, such as Killers, to balloon to 200 million. There might be less inexpensive productions than there used to be (the pandemic certainly didn't help), but they're not gone. And given that the MCU has been smacked around in 2023 and the DCEU is officially dead (while much more intelligent "independent" DC films survived), it's fair to say that movie Armageddon hasn't come yet. In fact, superhero flicks are now having a full-blown crisis.