Not sure if this is your main interest mate, but “Ping”. :)
And Helen Thomas survived them all, even the ones she caused.
Nonsense. Mere speculation—prove it. Classical evolutionary theory postulates 95% of all species are already extinct. Which species are you talking about? These theories and their adherents recycle themselves, they need an audience to sell their fish oil to and a job. Nonsense.
One thing is certainly clear, extinction events are common and regular even if they are not all global in scale. Life forms come and go and it will happen again.
A massive amount of these extinctions is simply the wholesale import of pests and rival plants across the world.
Think brown snakes in the tropics, zebra mussels in the Great Lakes, snakes in Florida, transplanted crops plus their diseases and pests around the world.
The end result will be a loss of genetic diversity as many niche species are replaced by hardier international varieties. But the result will also be a more stable ecosystem as niche species that can’t adapt are replaced by those that can, except for those areas where people don’t live, farm or modify.