That's supposed to tell us what exactly? That under the most optimal technical environment "the network" can substain large blocks?
I'm shocked

Actually, no, they've been having huge problems with it; with nodes crashing all over the place and such. Of course: Bitcoin Core nodes on testnet are unaffected: They're just ignoring the XT chain entirely, banning those peers, and continuing on as if they didn't exist.
If hypothetically more then seventy five percent of the miners supported BIP101 after January. Would Core recognize the will of the economic majority and implement BIP101? If you would implement BIP101 under such conditions you will have my full support. However if you intend to ignore the economic majority and still attempt to push your own agenda while circumventing and undermining the proof of work consensus then I will accuse Core of tyranny and totalitarianism. Which one is it Greg Maxwell, can you answer this question?