Anything but a chain split, please. It sucks to think that my (and others) hard work onboarding new folks will be for naught. Both Amaury and CSW have not been helping this case AT ALL.
Anyway, this isn't a trouble: no >32 MB block will be mined in a near future, so raising the limit is not a problem. However, new OP_CODES could end in a chain split.
Only if miners actually include transactions with new op_codes into blocks. The split will happen if part of miners use Bitcoin ABC with canonical sorting, and part do not.
Saying no to 128MB limit doesn't mean there will be a split. Only if a block >32MB is actually mined by nChain, and other miners do not follow it, then we have a split.