So far, Asian football has only improved slowly and even then it is not really visible significantly, the main problem is that the players as whole do not really have the experience and ability to compete with the team that always dominate the World Cup.
Some Asian countries may have naturalized players or players who can develop in European football, but that is only part and not as whole.
And if we talk about Saudi Arabian football, what is developing is not the Saudi Arabian national team but the domestic league like the SPL because it is filled with European players.
Despite having very good economies and population things are not going as they needed due to personal conflicts and other things were mostly countries favour their regional partners instead of having some central policies I am no confident about their development as we have in African region because they are having good policies, and they are working hard for having better results in coming world cup mostly teams will be having chance of elimination in group stages with just Japan or South Korea can go for the next round but as we have some good work from Saudi Arab things can take good changes but it's also needed long time for having impact.