Absolute nonsense. Unless you are saying that a significant majority of all mining nodes are willing to accept a block larger than 1 megabyte (in which case it is Core that is trying to create a consensus split by refusing to accept the longest chain). No. In this case, a minority of miners would be willing to accept such a block. As a result the valid chain would quickly grow longer. Only those nodes foolish enough to accept and mine on top of an invalid block (such as so-called SPV miners) would be affected, and any miner dumb enough to accept an invalid block deserves to waste hash power on a dead chain.
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No. Not in any real way, it couldn't. That's a whole lot of FUD and nonsense. If I didn't know better, I'd think you were just another sig ad spammer.
A fork most certainly could have happened because of the BU and SPV miners. Those miners make up nearly half of the entire hash rate of the network. If the SPV miners and BU miners began building on the invalid block, then there would be two branches that are just about the same length. As we have seen in the July 2015 fork, the SPV miners could accidentally cause this to happen. One chain would probably die off once the human operators got involved as happened with the July 2015 fork....
No. Not in any real way, it couldn't. That's a whole lot of FUD and nonsense. If I didn't know better, I'd think you were just another sig ad spammer.
Now those miners should have learned from the July 2015 fork that SPV mining can be problematic, but I don't think any of them have stopped doing SPV mining. It really all depends on how their validation systems work, but such a scenario is entirely possible as we have seen in the past.
I apologize about some poor word choice in my earlier posts. I will fix them.
Most definitely. I'm certain that there would be a fair amount of support for a proposal (post SegWit) that increases it somewhere between 10-20% yearly. However, there is definitely going to be very little-to-no support for proposal such as the one from Luke-jr. That proposal even goes as far as reducing the current block size. 
Supposedly Luke-Jr is going to modify it so that by the time the hard fork is predicted to be ready to activate, the period of the smaller blocks has already passed.