Portugal has gone to shit tbh, none of the teams managed to replace all the players they sold. Teams like us and Chelsea copying their strategy of signings tons of young players and loaning them all out to cover the costs hasn't helped, along with other teams getting a lot more aggressive with their south American youth scouting. The clamp down on 3rd party ownership probably hasn't helped either. The fact that Championship teams are financially bullying Benfica and Porto probably tells it's own story. Can't see them improving anytime soon either as the money just isn't thereIt was England a while back tbf :)
Speaking of leagues that have gone to shite, Russia and Portugal haven't put in a single credible team in a few seasons.