Interesting data...faulty conclusion.
While it is extremely unlikely that functional DNA strands from 100 million year old samples can be extracted and used directly, this is far from the only methodology to recreate an ancient life-form.
Start with any descendant species. The DNA will contain many segments which it inherited.
Proteins do break down, but the breakdown products can be used to extrapelate back to the original molecules.
A sufficiently large specimen, say several tons, frozen under the Antarctic Ice, would potentially yield a usable sample, and almost certainly would yeild a statistically large enough sample to recreate the original DNA...a couple miles of ice prevents an awful lot of high energy particles from reaching the sample.
We cannot prove with absolute certainty that such lifeforms haven't survived somewhere--perhaps not on Earth.
In the absolute worst case, having a decent idea of the genome expression from the fossil record, and assuming we learn to understand how to manipulate DNA, we can produce individuals and/or species 'replicas' which may or may not be identical to the original species, but would represent how such species probably looked and acted based upon our knowledge and speculation.
I'd bet that at the very least, someone will succeed with the last possibility...not this decade nor next, but probably within 500-1000 years barring major setbacks (like asteroid strikes, global or our species destruction.) Possibly by the end of the current century.
