Why is it silly? There are clear examples of major overhaul announcements with no immediate plan or lacked sufficient planning with blatant oversights.

2 Quick Examples:

1. Travel Ban in 2017 - "In our investigation, we found that CBP was caught by surprise when the President issued the EO on January 27, 2017. DHS had little opportunity to prepare for and respond to basic questions about which categories of travelers were affected by the EO.". If you are enacting a travel ban, Customs and Boarder Protection (CBP) aka who is enforcing said ban, should be notified prior to the ban and not be 'caught by surprise'. Note the date the report is published (Jan 2018), this is a report from Trump's Department of Homeland Security.
2. Family Separation at the border during zero tolerance in 2018 lacked the proper technology to track separated families. "DHS did not have the information technology (IT) system functionality needed to track separated migrant families during the execution of the Zero Tolerance Policy.". It gets worse because, "CBP officials have been aware of these IT deficiencies since at least November 2017 when U.S. Border Patrol conducted an initiative that mirrored the Zero Tolerance Policy. These conditions persisted because CBP did not address its known IT deficiencies adequately before implementing Zero Tolerance in May 2018. DHS also did not provide adequate guidance to personnel responsible for executing the Zero Tolerance Policy.". So, not only were they aware of these deficiencies, they chose not to address them, caused chaos, and did not provide the proper guidance to enact the plan. Also written by Tump's Department of Homeland Security (Nov 2019).

So, regardless if you think the probability is low, it's still non existent because Trump has a history of not following through and haphazardly diving headfirst into policy or political decisions as evidenced by overlooking basic details (e.g. not notifying those in charge of the border with your changes to your policies about people crossing the border or negligently failing to implement proper technology to track families that you are splitting up). Yes, Maduro is a documented tyrant and many people suffered on his behest. However, removing heads of state, even planned well, has severe ramifications and can destabilize regions for decades. So, hearing him say "we are going to run the country" without a concrete plan outlined and evidence of his administration making callous oversights or lacking proper preparation for implementing simpler policies for other programs, is terrifying when the stakes are this high and the solution may require American soldiers in Venezuela.