How likely is it Earth will become the next Venus, in regards to hellish temperatures?
Zilch.
Regardless of which climate-porn cult figure is proselytizing, the end result is a stream of soon-to-be climate change doomsday scenarios within the next 9 to 12 years.
The "doomsday" is always categorized as an "existential threat" due to the "extreme" global warming from human CO2 emissions, which will deliver onto us those Venus-like temperatures.
NOT.GOING.TO.HAPPEN.
Unfortunately, even those who definitely should know better can't resist the temptation to spread the ludicrous claims of Venus-like temperatures that will "cause" oceans to begin to boil.
As the adjacent chart reveals, both atmospheric and surface temperatures of Earth are a fraction of those associated with Venus (the orange 430°C and red 460°C lines).
Since the beginning of the satellite climate measurement capability, Earth's lower troposphere temperature dark blue line) has fluctuated between -2.5°C and -5.8°C and the surface temperature of the Tropics (aqua line) have fluctuated between +17.8°C and 19.0°C. and as the end of 2020, those temperatures were -5.1°C and 18.4°C, respectively.
As the empirical evidence displayed on the chart indicates, Earth's temperatures have fluctuated within a very limited range over the last 40+ years, without even a hint of the pending Venus-like "doomsday."
And this has taken place during a span of very high human emissions from fossil fuel combustion. On the chart, note that the monthly changes (black dots) in Earth's CO2 levels over that 464-month span are plotted.
Despite the releases of the huge amounts of human CO2 into the atmosphere, the actual climate change impact on Earth's absolute temperatures is the antithesis of a possible Venus style "existential" threat of runaway tipping point temperatures.
View additional temperature charts. Note: Above chart plots created using Excel. Absolute LT temperatures based on 50/50 combination of RSS/UAH satellite temp measurements. Absolute tropical temperatures based on HadCrut Tropical land/ocean temp measurements.