sounds like sh!tstirring to me.
With CX in trouble with SARS, the last thing OneWorld is to be "kicking out" partners, and since EI are not competing on routes BA and IB already serve DIRECTLY, what cause could there be to terminate them?
Regardless of openskies, EI will never serve the breadth of destinations BA does ex LHR, nor do it with the same level of customer service with WW's ryanairising of EI. Thus people like me will continue to fly BA via LHR for some time to come I'd say!