WAC seems to be getting more aggressive with pushing TV series as part of their line up. But where oh where is the complete Dallas? It's been remastered. The Alaskans is a good pic. But The Flash was pretty atrocious. There's a reason it only ran from Sept. 1980 to May 1981.
WAC has a goldmine of vintage TV it could offer up. The Dukes of Hazzard, Falcon Crest, Knots Landing, Growing Pains, Head of the Class, Perfect Strangers, to say nothing of the mini-series: North and South, and, The Thorn Birds.
But The Flash?!? Scraping the bottom of the barrel on that one!
It has a lot of fans. Quite frankly, I'd rather have The Flash than any of the ones you list there.
The Flash may not have been successful in its day, but it has a significant cult fandom, especially since that version of the character was made canon with numerous appearances in the CW network's very popular Flash reboot series and other Arrowverse crossovers.
Superhero content in general still has tremendous market appeal right now. It's also a short, contained series that's easy to binge. This show is an incredibly easy package to market and will undoubtedly sell well to collectors.
Meanwhile, I'd reckon that audiences still interested in shelling out to permanently own multiple box sets of long-running 1980s soap operas like Falcon Crest or Knott's Landing must be dwindling to near zero by this point. All of those shows mentioned above are better suited to streaming. They don't stand any chance of making a profit on physical media in today's market.