Yep, Northern Ireland, Ireland and Scotland have suffered the most. English footballers still present but there was a time when Scottish players were looked to in particular for flair that many English players hadn’t (John Robertson, Kenny Dalglish, Denis Law). Now they look abroad.
Yep, basically welsh, scottish, and
irish in players in PL were replaced with players from France, Brazil, Germany, Netherlands, Spain, Africa, Portugal, Croatia, Scandinavia, etc
Check the FA Cup finals line-ups, until 1997, 99% of non-english players were from Scotland,Ireland, Wales, and Northern Ireland...past that year the numbers started to decrease as each year passes, to the point that nowadays you can barely find 2 scottish/irish/ welsh players in the 2 finalists teams, sometimes not even 1.
Scotland national team took the hit by a lot, as they look abysmal now compared to the 70s,80s, and 90s... haven't qualified to the WC since 1998.