But as we know better than almost any fan base, that's not how it works. Comcast is paying the Phillies to A) be able to sell Comcast products and B) be able to charge other services to carry their channel, and not do business with anyone who won't. The blackout rules are also a product of this. Even after all these years, and despite the legal loophole finally closing, I believe you still can't get NBC Philly on Directv because they never made a deal (I know you can't get NBC NW up here).
Some of these TV deals are in place for a long time. The market reality of streaming has outpaced them, and will probably look completely different by the time the deals are up. Will it even make sense to have local TV deals in 20 years? Obviously the bigger-market teams will try to hold on to that. But for now, I'm not sure it's actually that big a deal if one RSN is on Hulu but not YouTube, and so forth. They are all still relatively small, not all of them are going to survive, and most of them do offer the market's primary RSN on a reasonable tier. One also assumes that what is now a cheap ESPN+ product will eventually turn into a significantly more expensive all-ESPN product. You could still have carriage fees at that point too - but they'd go through your ISP or phone provider rather than your TV provider (not that they aren't often the same company already).
What's ironic is cord-cutters were supposed to save money but I'm not sure that's really the case anymore, it's cheaper to just buy your cable and internet together, and in both cases adding sports tiers or HBO starts to add up. At worst you have to negotiate when a promotional offer expires.
I also don't think Gen Z is the customer base for cord-cutting services. Maybe their parents have switched, maybe not, but of the 18-24 year-olds who actualy live at home I'm sure plenty of them still get cable, or get nothing (but have Netflix, maybe ESPN+ with the Disney bundle). Or just dont' care. Or only watch sports in bars or with friends.
Of course, the most popular sport is also still the one that's on free television all the time (even the MNF games still air over-the-air in local markets). Imagine that!