Honestly, with a decent run of injuries or at least a far kinder run than last year, TPJ not getting anymore stupid suspensions, Bird staying fit for 25 Rounds, Isaako finding his feet quickly at Fullback, and pending our Origin workload being somewhat reasonable, I don't think the Top 4 is totally out of the question.
I know those things are all highly variable and we do need a lot to go our way, but it definitely isn't impossible.
I think the Top 4 sides last year all objectively probably got a little bit worse over the offseason. Roosters lost their trump card in Cronk who is basically irreplaceable as Melbourne showed, the Storm have now lost key players in Croft and Chambers and have not settled on their replacements yet and Smith gets another year older. Souths have lost their best Forward in Burgess with no replacement and the Raiders are at best even going into 2020 but definitely not any better. I still think they will all make the finals, but I don't think they'll all run in the Top 4 again. There is plenty of change possible in 2020 for the ladder and no matter how highly you rate Croft, it's hard to not objectively agree that our roster looks better going into 202 now than it has for a couple of seasons now.