AOS will continue to outsell TOW yes. The majority of TOW players are still using their old models hence why the O&G Boxed set is still readily available even though it contains new sculpts.
New players coming to the game are either coming from word of mouth or from Total War.
For years the TWW community was crying out for TOW to return and some of those werent even around for WHFB. I know because Im mates with some of these people, these very same people that since TOW has returned have not bought into it.
I dont want to make it about TOW vs AOS but at the end of the day TOW will always seem like a cash grab to me. I love the setting but the Mortal Realms offers me so much more, including modern sculpts, not decades old ones at modern prices.*
*Stares at Ogors and Skaven waiting for their updates.