Just checked there now its ten years since a Kerry club reached the All Ireland senior final so its not just winning it their having trouble with but reaching finals as well.
I'm arguing the current Kerry club system has increased their chances of winning intermediate and junior All Irelands and the opposite at senior level.
Their lack of a senior club AI is nothing to do with a system, and only betrays your lack of understanding of Kerry football. The true strength of Kerry football is that the game is strong in every corner of the county, and while I'm not sure how many clubs they have, even the smallest junior club imaginable tends to have a decent structure, good coaches, and a clear pathway for players to develop to the best of their potential, via the divisional system. Their most ordinary junior sides would be middling intermediate in most counties.
That same system handicaps them in terms of providing a senior All Ireland contender - ten of the last twenty Kerry SFC winners were divisional sides, which means that 10 of the last 20 Kerry contenders in the All Ireland club race came in on the back of not actually winning a county title.
I'm sure if their main aim was to produce All Ireland club winners they might do things differently, but they have other goals that supercede that by some margin.