The reason for what happened in MK3 was because of the whole Pesina brothers (Bloodstorm) debacle, not because Midway wanted to have those characters gone, though.
Anyways, aside from the big 4 (Sub-Zero, Scorpion, Raiden & Liu Kang) not going anywhere because the collective fanbase would riot, flip tables, lose their shit and want to burn the NRS down like that Reiko Twitter douche, yeah (IMO), it would be nice if the majority of the Trilogy roster sat out for MK11.
If you want Trilogy 2.0 then MK9 is there to play on last-gen, and recently in MKX 20 of the ones from MK9 are also there.
You got 2 games full of Trilogy characters.
Time to move on.
Cassie, Jacqui and Kung Jin should get some time to be better fleshed out and not in the shadow of their parents, and characters like Noob Saibot, Kabal, Jade, Sheeva, Sindel, Rain, Stryker and Shang Tsung can replace 1 of the dead / incapacitated characters from MKX or can be sold as DLC.