I don't see this. BEVs:
LEAF sales in September were the second highest month for this year, only May is higher.
Bolt sales in September were the second highest month for this year, only March is higher.
Model S and Model X are both records in September.
Model 3 is at 78K units in the US YTD.
Prius Prime is at 20.5K YTD (#2 in the YTD spot)
Leaf is at 10.6K
Bolt is at 11.8K
From Feb 2018 onward, Model 3 monthly sales have been past 2K units/month. During this period, not a single month of Leaf nor Bolt has reached 2K.
For July, Aug and Sept, estimated # Model 3's sold were 14.2K, 17.8K and 22.2K, respectively. This is with no leasing thru Tesla possible.
For Leaf, the numbers were 1.1K, 1.3K and 1.5K. No other plug-in vehicle on those months has reached even 4K units in a given month.
So, Model 3 coming out of nowhere w/a very rocky production start last year is now outselling Leaf and Bolt each by about 10:1, or more, in the US. That seems like decimation to me.