Let’s consider timing as well.
First, the remaining Classic 5’s have no feeder. Archangel, Gambit, Banner, Strange, and now Kitty. No Latest 5 has had a feeder since approximately last August when Okoye got a feeder during the MCU 10 celebration, so it seems like we should expect nothing to happen for Doom/Kingpin/Cable for a while.
Feeders happen about once a month on average (sometimes there are 2 in a month, but then the developers skip a month). New 5’s drop about once every 6 weeks, with store updates about 2 weeks later. Let’s assume that continues and extend it out a bit. Also make this a best case scenario by only feeding the oldest people first.
February 2019. If we have 6 weeks until the next update, that means that February will have 1 feeder with no other additions to the pool. Let’s say it’s Gambit. It may happen pretty soon, as it’s been 4 weeks since Reed → Surfer.
March 2019. Early March (around 3/7) should see a new 5 (MAR19), mid March a store update. Feeder in early March (let’s say Archie). Banner, Strange, Kitty, Cable unfed.
April 2019. Late April (4/18 ish) should see an Endgame 5 (END1). If we get an early April feeder, it might be Banner or Kitty. Let’s say Banner. Kitty, Strange unfed.
May 2019. Maybe a 5 on May 30 (let’s pretend there’s a second Endgame person, END2), but a store update drops Kingpin out. Feeder comes, maybe Strange to be around Endgame. Kitty, Cable, Kingpin unfed.
June 2019. Store update drops MAR19 out. No new 5. Maybe Kitty gets fed now? Banner, Kingpin, Doom unfed.
July 2019. New 5 comes, presumably a Far From Home character around 7/11 ish. Feeder comes early, say Kingpin. Banner, Doom unfed. End of July FFH5 drops into Latest, pushing out MAR19.
August 2019. New 5 around 8/22 (AUG19). No store update. Feeder, let’s say Doom. Banner and MAR19 unfed.
September 2019. Store update 9/9. Feeder, let’s say MAR19. Banner and END1 unfed.
October 2019. New 5 around 10/3 (OCT19). Feeder, let’s say END1. Store update 10/21. Banner and END2 unfed.
November 2019. New 5 around 11/14 (NOV19). Feeder, let’s say Banner finally. No store update. END2 unfed.
December 2019. Store update 12/2. New 5 around 12/26 (DEC19). Feeder, let’s say END2. FFH5 unfed.
January 2020. Store update 1/13. Feeder, let’s say FFH5. No new 5, AUG19 unfed. They are finally caught up with all Classic 5’s, basically.
Now, if they pushed Kitty back every time, and kept timing the same for everything (and no double feeders), she could be fed as late as January 2020. Hopefully it’s a lot sooner. If they only fed the oldest characters first, it should be no later than June.