They have a very young population and still have medieval attitudes to women and sexual minorities. I wouldn't be too sure that Saudi Arabia doesn't see some turmoil in the coming decades, that's if they don't continue to lock up or decapitate all the dissidents.
You can still earn a very good salary in European football, have a good standard of living and culture and not melt in the heat. Anybody moving to Saudi in their prime is silly ****.
The majority of players in Ligue 1, Eredivisie, Portugal will be earning €10,000-€20,000 a week. Even the biggest clubs in the CL every season will top out around €50k/week.
That’s not shabby but you’ll probably be earning that for 5/6 years at your peak and it’s got to last you until you’re dead.
By the time you’ve paid your agent 15% and the taxman has his slice it’s not a lot of money to last 50 years out of work
Also worth pointing out that plenty of football players are Muslim and while they might not advertise it, are not strongly opposed to many of Saudi Arabia’s laws.