Its only a “game changer” for the very small minority of people who didn’t realize that this was a hoax from Day 1 and actually care. Most conservatives knew this was BS from Day 1. Most Libs don’t care - its all about getting Trump even if its based on lies. Gowdy calling this a game changer shows how disconnected he is from the realities of politics.
Which makes complete sense since most proglibs reject the very system of existing institutional controls that govern the rules of conduct. Since they believe capitalism is inherently an immoral construct, any structure based on those legal principles is to be attacked, not respected. Reverse the situation, and what patriot would be opposed to someone like Trump (ie Obama) violating entrenched communist power & control systems? On the contrary, he would be hailed as a hero in advancing the cause of liberty & freedom (socialist "democracy") no matter the process.
So, when the left eventually comes to admit that espionage and other coordinated activities among both foreign powers and domestic branches of government were conduced to conspire against Trump gaining CIC, who will then express regret and/or remorse? No one, that's who - they are glad Obama et al tried to save "democracy" for "the people".
That's why I keep saying this is the point where warfare is conducted. When you have two diametrically opposed parties, neither of which is going to admit the other may be right, then it comes down to a sheer struggle for physical control. A that point, the winner gets to dictate terms, and the loser is disenfranchised.
I'm also pretty sanguine about the eventual outcome, because even a cursory review of history notes the winner is almost always the ones who hold both physical & intellectual advantages ie Trump supporters. The left is comprised of emotional defectives, who constantly complain and are consumed with bitter hatred for drawing the losing, short straw in life. It's why their women are ugly and the men - if they can be called that - are weird, soy poisoned, testosterone starved weaklings.
Now, when we finally get to the point where the grand reveal elicits a "so what?", it will be up to Trump to finally channel his inner Pinochet and rid these pests from the body politic.