UEFA and CONMEBOL, collectively, make up just over 30% of the votes. AFC, CAF, and CONCACAF, collectively, account for 64% of the vote. Also of note, the only two confederations that, by themselves, can form a majority are EUFA and CAF. It's not terribly surprising that we'd see AFC, CAF, and CONCACAF get more of an increase, both because the current allocation is skewed heavily toward CONMEBOL and UEFA, and because the voting structure favors the confederations that are proportionately underrepresented.
So let's go to some numbers:
Increase: Total/% of Prev/% of new Berths
AFC 3.5 / 77.8 / 25.0
CAF 4.0 / 80.0 / 28.6
CONCACAF 2.5 / 71.4 / 17.9
CONMEBOL 1.5 / 33.3 / 10.7
OFC 0.5 / 100% / 03.6
EUFA 3.0 / 23.1 / 21.4
Overall: Old Berth % / New Berth % / Nation % / % of nations getting berths (old) / % of Nations getting berths (new)
AFC 14.1 / 17.4 / 21.8 / 9.8 / 17.4
CAF 15.6 / 19.6 / 25.6 / 9.3 / 16.7
CONCACAF 10.9 / 13.0 / 16.6 / 10.0 / 17.1
CONMEBOL 14.1 / 13.0 / 4.7 / 45.0 / 60.0
OFC 1.6 / 2.2 / 5.2 / 4.5 / 9.1
EUFA 40.6 / 34.8 / 26.0 / 23.6 / 29.1
Number of members:
uefa 55
CAF 54
afc 46
Concacaf 35
ofc 11
conmebol 10
My suggestion would be that, rather than awarding a set number of berths to the confederations, that the number of berths be awarded based on the relative strength of the confederations as determined by a formula (one could simply suggest they be divided in proportion to the number of teams each confederation has in the top 50, with a minimum number of 1, though I imagine that the Rankings system would need to be upgraded).