Answer: Cheap Chinese EV imports or the Prolatariat, Comrade.
My comment on the economics EV sales is valid to date, but with the trade barriers to the USA & EC (world's 2 biggest auto markets) IMO (and I'm speculating here) BEV ex China pricing will plummet due to China's production potential.
At present ICE sales have dropped below 75%. Keep in mind that the top ICE sellers are Utes (dual & single cab) People Movers/4x4s which are driven too by tax concessions. (100% write off on taxable income in year of purchase to $80K + 100% refund of GST for small business & ABN holders)
We are now seeing the start of electrification of this market segment. beginning with HEVs/PHEVs Utes & 4x4s
PS: The reason Government has discontinued Fringe Benefits Tax on PHEVs is that they were leeching market share from BEVs (see chart posted above)