Not necessarily true.
For instance, I would draw chimeras. What is the likelihood that some molecular geneticist will create a human-(fill in the *******) hybrid? Is it theoretically possible. Yes. But art doesn't need to be the catalyst for scientific advancement.
Renaissance master Leonardo Da Vinci sketched the earliest helicopter, but without the engineers to bring it into existence, it would have remained just been a sketch,
If only imagination was needed, then we would've explored outer space thousands of years ago.
The ancient Greeks, Egyptians, and Celts, to name a few used math to build structures that lined up with the Summer Solstice.
As long as humans looked into the night sky, they've imagined visiting the stars, but it took the hard sciences and geniuses like Werner Von Braun to make it a reality.
Don't get me wrong, I have an affinity for various mediums of art.
You're correct about the right/left brain spheres of influence.
I don't think we need to commit the fallacy of bifurcation. Both art and science are traits that separates humans from the rest of the ******* kingdom.