The theory of evolution has always been in a state of flux; it is not currently correct, nor is it complete. Each new major fossil discovery has the potential of showing that some part of the theory is wrong.
When this happens, scientists revise their theories slightly to accommodate the new finding.
Since the book of Genesis clearly describes that God created the universe, then it must be true. The Answers-In-Genesis web site explains this clearly in their statement of faith, Section D, sub-section vi: "By definition, no apparent, perceived, or claimed evidence in any field, including history and chronology, can be valid if it contradicts the Scriptural record." Thus, if some observation, some fossil, some measurement, or some theory seems to supports the theory of evolution, then it is automatically false and is to be rejected.
There is no possibility that significant numbers of believers in creation science will accept the validity of any evidence in the future that contradicts the Bible.
A single observation which proves beyond doubt that the earth has been in existence for less than, say, 1 billion years would greatly weaken the arguments in favor of evolution.
There simply would not have been sufficient time for all of the natural geological and biological processes to produce the complexities of the present world.
Quite a few footprints of this type have been claimed to have been found.
Most systems of creation science teach that the earth is young -- that the earth and universe were created 6 to 10 thousand years ago. In the absence of evidence to the contrary, scientists make the assumption that the fundamental workings of nature are occurring today much like they were in the past.
For example, the speed of light, the gravitational constant, the charge on the electron, etc.
Using various genealogies and intervals of time in the Bible, it can be concluded that the creation week happened sometime after 8000 BCE. That is, that God created the world, the various forms of life on the earth, and the rest of the universe less than ten thousand years ago.
Since the universe was created recently, there could not possibly be enough time between creation and the present time to allow species to evolve by purely natural forces.