I think the pass rate will keep on dropping as the 1st or 2nd papers normally serve as introductory to familiarise students to the exam style & format.
Once that period lapses the examiner will have every pleasure to twist & turn the paper around to make it harder.
However on the plus side, with more exam papers to boot, student will have more oppurnities to familiarise with the paper itself.
I can see a trend in the optional proffesinal papers where the examiners try to maintain the pass rate at 30%
The core proffesional papers have an average 45% to 50% but i expect it will eventually drop to 40%.
Students that was happily hoping papers like financial reporting & audit will eventually becoming easy to pass was devastated here.
Since i have just sat that 2 papers myself, i have notice a very clever tactic used by the examiner to trick the students.
ACCA students have a "knack" to memorise the format & style of exam paper over the years, then they make their own assumption to handle it.
However, this time the examiner mischievously scrambe the order this time around.
F7 : after so many consecutive sitting, they change Qs2 into redrafting the FS & prepare SCE while giving some weird transactions.
Students without proper technic, skills or planning will get a shock & normally spend the rest of the time doing & redoing the QS.
Apart from that QS, Q1 & Q3 was pretty easy enough to score while Q4 & Q5 touching on the surface of standards.
F8 : Every one starting to love Alan Lewin gets the "bombshell" this time. As everyone thought SP qs will be asked they memorise & practice tons of
SP qs & (will spend the 15 minute planning time to draft the 1st question : normally SP). However it turn out to be TOC.
Most student whom cannot adjust & adapt will spend 15 minutes staring at the qs wondering what to do now (they will normally go
from

) to this (

).
Next, is the issue of going concern which they already ask 2 times consecutive, many lecturers including students predict it will never come out
& come out it did

.
My suggestion is that never trust your lecturer's view or prediction 100% but you can take their advice & guidance. Good lecturers like their students
to constructively debate the lecturer's view to build student's own mental skill. However, this rarely happen especially when there is a lot of students around.