Looks like the classic nodes are stalling, will be difficult to achieve a majority of classic nodes.
Hopefully the discussion will lead to an upgrade of core to bigger blocks as well, and preferably before the segwit introduction and more importantly soon...
Will the classic and core be able to co-exist?
Yes, if they both allow 2 MB blocks, why not, they currently do for 1 MB blocks.
As long as classic and core can handle 2 MB blocks whenever miners start mining 2 MB blocks, it should be fine.
Of course it also depends on the version all nodes are running, if most nodes stay on a 1MB version, then there will be a problem, once miners start mining bigger blocks. It is essential for the network to upgrade to the new bigger block versions (classic and core), otherwise there will be a fork.
However a fork will never happen, since I do not expect miners to start mining bigger blocks before a significant part of the network has switched to the new versions. Unfortunately, bigger blocks will only happen if core introduces bigger blocks as well.
So let's wait and see.
My classic node (vote for bigger blocks) is still running....
Well well, seems you figure it all out.
"Increase blocksize limit -> Potential Exponential"

"The blocksize limit should be big enough to enable mass adoption / potential exponential growth."

Braindamaged?