Quan Chi, nah, I hope that he sits this one out, since the timeline merging / time travel pretty much makes his whole necromancer shtick pretty useless.
Certain characters from the OLD 3D era are meh, but that doesn't mean that NRS can't give them a proper revamp like they did in MK9 and MKX for Kenshi, Tanya and Bo Rai Cho.
I still don't like Bo Rai Cho, but he sure as hell is 100% better than his 3D era counterpart.
I'd like to see those 2 in MK11 (Fujin and Havik), but we'll see.
Yes, Quan Chi can definitely sit this one out, guess the story of MK11 will be finishing of the remained revenants and set a new direction of evil for a new game.
Not certain 3D era characters are meh but most of them and I've already listed the newcomers rated. Let's see: We shouldn't forget that 2 of the 3D era fighters have already been in MK9 (Quan Chi and Kenshi). Certainly two 3D era characters that have established themselves. Then we have Shinnok, Tanya and Bo Rai Cho. Shinnok and Tanya were good new characters in MK4 and BRC got a decent revamp, yes.
So what is left from those 3D era characters you always want, that have never been playable in this new trilogy and aren't crap? Only Fujin and Havik IMHO. And I want them very much too. Reiko could be cool, but he'd need a similar revamp as BRC in MKX. Back in MK4 he was just Rain without a mask with Shang Tsung's MK3 eyes.
Through MK4, MKDA and MKD the new characters have gotten worse and worse. MK4 introduced Shinnok, Quan Chi, Fujin, Reiko, Tanya with Jarek and Kai being crap. MKDA's new characters, except for Kenshi, are full garbage in my eyes. I remember me being superhyped to finally play a new Mortal Kombat on my new PS2. And I hated them all, I never used them after trying, they were bland and not interesting. And yes, I only used the "trilogy characters" and Kenshi sometimes. With Deception released I was superhyped again. And again only Havik seemed interesting to me. As for the others: I hope they are gone for good.
So technically we share the opinion of bringing Fujin and Havik back for MK11. Reiko could be done well too.