"to the point of extinction" is correct and usable in written English.
You can use it to refer to something that has been reduced to the point where it no longer exists or is close to no longer existing. For example, "The species of bird was hunted to the point of extinction."
And it clobbers rival dailies to the point of extinction.
He has been hunted to the point of extinction.
The Asian tiger has been loved, worshipped, feared – and hunted to the point of extinction.
The Wood Bison was also hunted to the point of extinction before a few were saved.
The subspecies has been pushed to the point of extinction by poachers, who kill the rhinos for their horns.
The master plan by Daniel Libeskind, selected amid great fanfare in 2003, has been compromised to the point of extinction.
For the survival assay dead larvae were taken from the experimental populations at the point of extinction, ground with a pestle and mortar and the spore concentration counted as described above.
For hundreds of years, the largest land mammal on earth has been persecuted to almost the point of extinction by its greatest enemy- man.
Conservationists said the decision could jeopardise the successful effort to bring grey wolves back from the point of extinction.
The fact that many of the surviving languages are endangered and some are even on the point of extinction bears testimony to inexorable social, economic, linguistic, and demographic forces that continue to marginalize and consume indigenous linguistic and cultural minorities.
According to the RSPB, the last two breeding pairs of hen harriers in England failed this year to produce eggs for the first time in 60 years and are now on the point of extinction because gamekeepers working for rogue moorland estate owners have systematically persecuted the bird to protect baby grouse which live on the moors.
