Alternatively there's María Corina Machado who overwhelmingly won the presidential primary for that election but wasn't allowed to run.
So you can't just install this person as president now.
I am not sure what you mean by "control the government had"...they are the same thing. It is like the situation with IRA and Sinn Fein, this bizarre roleplay where people (for various reasons) went to massive effort to imply they were separate when it was obvious they were led by the same people. There is no distinction between the government and cartels...the assumption that there is makes no sense at all given the latitude they have to operate.
What's he going to do, kidnap her? Oh, wait.
If if had to guess, Maduro could have been take out with a GBU or two, but the US holds a grudge against him so they took him out to humiliate him, and send a message to others.
Not too many countries will go to the mat to support a leader who was engaged in narcotics trafficking, if the US is able to present a viable case (which they seem to intend to, if he's being charged in US federal court).
Commonly known as "kidnapping."
The US has no jurisdiction over Venezuela. This is pure mafia behavior by the US.
Today. She's still part of the same regime and party. It's not obvious Trump will let her stay in charge. Also the control the government had over the criminal gangs/syndicates/cartels was seemingly very weak anyway. Even if the current decapitated regime is allowed to stay it won't be very strong.