I've posted about it a few times being in the works as per some of the people I know over in the Netherlands who are involved football related things, here's more info:
https://www.hln.be/sport/voetbal/beneliga-zit-op-de-rails-elf-clubs-scharen-zich-unaniem-achter-project~a7872fb9/
The Dutch and Belgian leagues are working on a merger. Representatives of the Belgian 'Great 5' (Club Brugge, AA Gent, RC Genk, Standard Liege and RSC Anderlecht) met with the Dutch 'Great 6' (Ajax, PSV, Feyenoord, AZ, Vitesse and FC Utrecht), and both football associations had a meeting today, which apparently turned out very positive. Further studies are to be held.
The new league would exist with 10 NL and 8 Belgian teams, with all the big teams mentioned above in + other teams selected based on their league results in the last 5 years. Not clear yet when it would start. With this they are aiming to be the 6th competition in Europe, after the big five (England, Spain, Germany, France and Italy)
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I think it could be great; I hope they set up the structure so there's some windfall to the clubs who don't make the first division cut immediately. I don't think they have to aim below France/Italy or maybe even Germany from a quality standpoint...the infrastructure is there to have a very strong league, though the population and appeal might not be high enough to challenge them in terms of marketing.