If you remember the aftermath of the Iraq2 invasion (which a lot of people claimed was about oil) gas prices did not plummet at all but the reverse. Gas doubled at the pump, maybe slightly more.
In Venezuela it's extremely unclear how suddenly creating a giant power vacuum will allow the US to obtain Venezuela's oil.
On one hand, this seems classic from the Trump Admin in that rash actions have been taken with no future plans in place (cf. DOGE), on the other hand this does appear in line with the promise of "no forever wars" (no sustained US ground presence) and if the US does actually end up with the oil, then it will be at a very low cost (in terms of US blood and treasure).