That's kind of a silly argument. "People are better off paying $100+/month for 4+ streaming services than $25/month for one that has everything."
If your argument were that you'd have to pay more than the current combined cost, it'd be a better argument against mergers. Arguing against something because it's a better deal is just strange.
Instead of a one-time Blu-Ray purchase for ~$25 for a movie to watch as many times as you'd like, it's an ongoing subscription for $25/month. If you only want to watch that one movie in two different calendar months, you've easily doubled your spend.
(Yes, it is still apples-to-oranges because you may watch more than one movie in a month, but the flipside is that the $25/month is a variable catalog fee. The movie you want to watch may be "vaulted" that second month you want to go watch it. With Blu-Ray you control your film catalog, with Netflix some finance team does.)
(Also, yes, easy to forget Blu-Ray in this debate because Blu-Ray is dying/dead, especially in physical retail with Target and Best Buy dropping its sections. You can also substitute a lot of the same arguments here with arguments for Movies Anywhere and/or iTunes Store.)