The Empire however,had every and many options to resist the White-Gold Concordat,and they would have won too,but the Emperor just could not find a spine or a set of balls within himself to do it.
I am very curious about the explanation behind this theory. Like
Rimfaxe96 already said: '
do tell me how the Emperor could have defeated the Dominion with decreased manpower and internal struggle because there was barely anyone left to keep law and order'.
During the Sack of the Imperial City in 4E 174, lord Naarifin's Aldmeri army surrounded the Imperial City. With his main army, the Emperor (Titus II) fled north to Skyrim in order to join with reinforecements under General Jonna. The invaders sacked the Imperial City soon after, and the White-Gold Tower was burned and looted. The Aldmeri Dominion committed many atrocities against the city's populace.
A year later, Titus II split his remaining forces into three hosts that surround the occupied Imperial City. It took long, and many died, but the Aldmeri Dominion army in Cyrodill got crushed and the Imperial City was recaptured. Lord Naarifin was hung from the top of the White-Gold Tower and kept alive for thirty-three days.
They won that battle, but not the war. Titus II realized the Empire was too exhausted to continue fighting. There was internal struggle, decreased manpower, and the Aldmeri Dominion was just stronger overall. What was the best thing to do? Fighting until the last man standing dies? Fighting until they killed the last woman and child? Or surrendering and making the best out of an unfortunate situation?
Compare it to a soldier that is wounded, and has to get medical care before going back to the battlefield. In the state he is in at that moment, he would never make it. So he has to take a step back to recover from the damage that was done. Which is what Titus II did.
He negotiated with the Thalmor and signed the White-Gold Concordat. From now on, the Thalmor had free reign to stamp out the worship of Talos in Tamriel. Also, the Blades got disbanded and they (the Dominion) got a large part from Hammerfell.
We have to look at this situation
as neutral and objective as possible. No one liked it that Talos got banned. No one liked it that the Empire had to surrender. But what was the best thing to do at that moment? Should the Empire just carry on and, like I said, keep on fighting until they get crushed? Or come to an (temporary) agreement with the Thalmor that gives the Empire some time to breath?
You see, if you continue a war and don't surrender until you get brutally defeated, there is
no such thing as making compromises. If you get defeated, you are
100% dependent on their mercy and have to accept whatever terms they come up with. Because
you lost. You lost and you have nothing to say anymore. And you can disagree all you want, but that is just the way things are.
If you put your pride aside and surrender, you get time to recover and regain strength to continue the war. That means answering to a treaty you don't exactly agree with, but at least it is an investment in the future. Remember that the right decision is not always the popular one. Sometimes things get worse before they get better, and expecting that beating the Thalmor would be easy is straight out naive.
People need to remember that accepting the Concordat is a short term thing. On the long run it means true freedom and victory over the Aldmeri Dominion. And isn't that our main goal?