So that's where things stand. Let me know what you think--like I have to ask!
I had a look at the save and things aren't looking good.
As pigswill mentioned, trading for all those cheap techs has resulted in WFYABTA with all of the AIs at the moment. So you'll either need to get one to Friendly or wait until they forget a tech trade before you can do any more trading. You have Construction on both Mehmed and Mao but can't trade it for anything.

At this point you face the prospect of having to research CoL, Monarchy and Currency yourself, before you can even start on CS and the Liberalism beeline.
With that in mind, why are you researching Literature? All of the AIs have it and Ragnar has marble. Do you really think you still have a shot at GL?
According to the trade screen Ragnar has horses (obviously gotten in trade from Mehmed) and he has a war elephant and catapult sitting in Uppsala, so war with him isn't going to be easy IMO. I'm still not sure if the people predicting an easy war are basing their opinions on the BetterAI or the standard AI, but based on my experiences with BetterAI I don't see this as an easy war. Ragnar does has limited production capacity in his tiny empire, but with enough of a tech lead I expect him to be a formidable opponent.
Ragnar also has a second source of iron in the south of his empire, so a quick pillage to deny him metal may not be an option (although you could probably position some mounted units down in Mehmed's territory to try to get the second iron).
There was one major positive development that wasn't discussed in the update. Mehmed has founded Christianity. AFAIK the BetterAI mod didn't do anything to change the way the AI deals with religion, so I would expect Mehmed to convert relatively soon. That would set up some tension between the AIs and would hopefully provide a distraction for Ragnar. At this point I think a significant amount of AI-AI fighting is your only chance of salvaging this game. It's also important that you have a military built up so that you can take advantage of any AI DOWs (unlike the last game where you weren't ready to fight when Huayna and Isabella went to war).
Some other things I noticed from the save:
Moscow doesn't need a Confucian monastery. Either a stable or temple or catapult would be a better build there.
Most of your other cities don't have granaries yet. You do realize that Expansive gives cheap granaries, right?
You can trade fur to Mao for 4 GPT.
You may want to build some triremes when you get a chance to prevent the pillaging of fishing boats when you go to war. In addition to losing

, the fishing boats are feeding most of your scientists, so losing them would cripple your research efforts.
The only reason Mao is not Pleased like the other AIs is because you cancelled OB with him.