Will science ever prove the existence of 'God'?

NO. No, because science never “proves” anything. Ever. It cannot even prove that the Sun is in the middle of our solar system. The scientific method is a process of experimentation, observation, testing, hypothesizing, adjusting and discovering. No assertion is ever “proven” in science. Proof only exists in mathematics and logic.

Complicating this, you’re asking people to predict the future. Your Question Is Naughty! I know you said, “Do you think …” but the problem is that we cannot even predict a few months from now a political election. How the heck can anybody answer this question with any more than a, “Hmmm. Maybe” or “Hmm. No.”

We’re left falling back on the scientific method and the nature of proof. That’s it. And given that fact, the answer will always be “no”. If you’re asking if we’ll ever “discover” evidence for a deity, that’s unlikely since the evidence for the same shifts depending on who you ask.