Electron and Falcon 9 have have entirely different capabilities. Electron may be more flexible but it's unable to launch geosynchronous satellites, which are by far the most profitable in the launch industry.
"SpaceX’s existing business faces headwinds. It expects to see declines in launches of its workhorse Falcon 9 rocket for 2019 and perhaps 2020. Global demand for launching commercial satellites, its core business, is stagnant, with some satellite manufacturers and customers looking to permanently exit the market segment."
Commercial satellites is broad - does the above mean that the market is stagnant for high orbit geosynchronous? If that's the case, then the advantage would be to Electron - but that assumes something about the profitability of low orbit.
A reference, where the WSJ got this information, would have been nice.
Otoh there are capabilities - and many distinctions between SpaceX and Electron. On the other though is the market and demand and you could have something great but if its market isn't likewise then you're going to be hampered not on the, shall we say, supply side of the rocket you offer, but rather the demand side.
What is worse, they still throw away the rocket once they launch. A "gas only" Falcon 9 rocket (which is to say they have the means to launch and relaunch over 10 times) is ultimately going to be the most cost effective path to space. Not sure Electron can get there from here.
As lithium-ion batteries improve the potential mass fraction for each Electron stage gets better: lighter batteries mean more propellant. In a decade (maybe sooner) it might become feasible for the first stage to retain enough propellant for a propulsive landing like the Falcon 9. And in this case I think there's a big pay-off with the electric pumps: there's no need for a hoverslam, since the engines should be able to deep throttle to an extreme degree that's not practical with conventional rocket engines.
In a shorter time-frame the Electron first stage, because it is so small, is probably air-recoverable using the same approach that ULA is considering for recovering Vulcan engines.
A fun engineering problem to be sure.