Indiana Jones is not really a franchise film in the modern sense. It's a sequel, sure, but it comes many years after the last one and is mostly a self contained adventure. It's not like the MCU where everything builds up on what came before or teases what comes next to try to build up a larger universe. Whatever attempt there might have been to make Phoebe Waller-Bridge into the next Indiana Jones, didn't make it into the final movie.

Same for Flash, the DCU is a mess and already scheduled for a reboot. Nobody really cares about the DCU anymore, since nobody really even knows what the state of that universe is. It's just random cameos without a clear continuity and it all will be blinked out of existence in a bit anyway.

What the MCU is doing is much more interesting, as they used to have that shared universe and it was working. But what they have done in the last few years was a mess. They introduced multiverses, time travel and gods and basically ruined the own continuity they worked so hard to build up over the years. The power levels are completely out of control and it's hard to care about what is happening when everything can be multiverse'ed in and out of existence at will.

I don't think anybody will give up on franchises, the latest Batman already has a TV spinoff with The Penguin. But they hopefully will scale it back a bit and focus on making good movies first, not just endless teases of what will come next and trying to cram every cameo into the film they can think of.