I don't play AoS and haven't collected many of the models because the old fantasy aesthetic was what I loved most. Still, I'd love to see the Tomb Kings return in some fashion and would probably even start playing AoS if they got a couple of resculpts (some new chariots, archers, and horses would be nice). Actually if they did that I definitely would start playing. (TK were my first army - really regret letting so much of my collection go...)
That said, like a lot of players who collect(ed) TK, I'm mostly looking to (re)complete my collection. If GW just brought back the plastic kits for a week I would get everything I wanted and be pretty happy. (They are used in other systems after all.) Bring back plastic sphinxes, snakes, and tomb guard for one week, made to order, and I swear on the kidney I will sell to fund this project that I will buy three of each. Possibly more tomb guard.