No, the real reason why any movie franchise is rebooted can come down to one word. Actually, a symbol- $. They know the original made money. They can redo the whole damn thing without having to hope a new idea won't flop. People already know and are interested in Batman, Spiderman, the Hulk and Superman. So, they'll do reboots in hopes of finding one that will make them Mega $$$$.
But the problem is that the people are jaded from too many reboots. Reboot fatigue has set in. Keep in mind, your ideas for original movies using the characters you've recommended are great. But too many of them are not iconic characters. I mean, very few people, outside of comics, have heard of any of them, and that means you are starting to sell your movie to a niche crowd to begin with. Personally, I hold out for Patsy Walker, who started out as a model in 50's girl comics, ended up marrying a millionaire industrialist, divorced him, found out he was doing wrong from the Avengers and put on a costume formerly owned by a hero named the Cat, and became a superheroine.
She ended up getting real powers of her own, joined the Defenders and ended up the bride of Daimon Hellstrom. But that whole story is entirely too scattered to make a single movie out of.
Catwoman could work as a reboot, but only if we burn every damn copy of that Hellaciously bad Halle Berry flick with the same name. I'd like to see her done by someone like Roxanne Dawson, but younger. A more 50's style Selina Kyle as a true cat burglar. Meeee-ow.