Seriously can't wait to see what strategies the next P/F classes use to smash step 2. I have said in the past that you could potentially just run a lightweight step 1 deck like bros and then go crazy with Dorian for step 2, but we'll see. Could be that only the good test takers can get away with doing the bare minimum to pass step 1 while killing step 2. Who knows?
It probably depends on the timing of s2. If taken after 3rd year like it is traditionally, I would be curious how many people will study for it and ignore their class curriculum in the first 2 years. Maybe 30-40%.
Honestly until you get a decent grasp of the organ systems, I doubt you can even study for S2. At least I couldn't. For us, organ systems happened in 2nd year and I doubt I could study for s2 without finishing each organ system module.
And I also doubt you need that much time to study for S2 like you do for S1. I studied pretty hard for s1 with 2 years of studying all day long, in the summer, to score in the 250s on S1. For S2, pretty much studied a few hours each day and on weekends for the shelf exams and 1 month dedicated and scored in the 260s (same percentile as s1 but considerably less effort).
For the rest 60%, who likely will wait till mid-2nd yr or 3rd yr, it will be less crazy than s1, mainly because you won't have the time like you do now. Sure, some people will pick easy rotations, etc to create more study time but rotations will be taking majority of your time unlike now when all your focus is on s1.
My bottom line is, I am curious, but I doubt people's study habits will change much for s2 like they did for s1 mainly because of limited time in 3rd year when you would be studying for this.
S2 is also a much more clinical reasoning exam than a memorizing exam like s1 can sometimes be.