In this world:
There is no difference between online customers and retail customers, just one type of customer who expects a rich multi-faceted omni-channel experience. Therefore, you won’t need to have separate directors for e-commerce and retail or retail and online CTOs. Instead you only need one omni-channel CTO.
Similarly, having both online P&L and a Retail P&L, online sales vs retail sales, online stock vs retail stock, online margins vs retail margins, can be maddening to keep organised.
Retailers who remain using the old distinctions only strengthen old silos, cannibalise their own sales, create intra organisational politics and will fail to genuinely compete with their online only competitors.