The old Nick Jr. show has gotten a reputation of being the equivalent of "LOOK AT THE SCREEN, YOU DUMB KIDS! LOOK AT WHERE WE'RE POINTING AT THE SCREEN! THAT'S YOUR ANSWER! YOU'RE STUPID, YOU DUMB KIDS!". As shows like Blues Clues and films from people like Disney, Pixar and even the genius duo of Phil Lord and Chris Miller (P.S. Into The Spider-Verse was INCREDIBLE) prove, children can understand and pick up from things and don't to be told "Look at this". You can be silly all you want, but if you also give time for quiet moments and let children process information for themselves, they can learn something while they're having fun. That's why Blue Clues was so beloved back in the day: it gave children watching plenty of time to find the answer for themselves before telling them. Dora just spelled it out for them while being loud and obnoxious (from what little I remember back when it first started).
How do you take that and change-focus to make it a Indiana Jones-type adventure movie (they've apparently made Dora a much older, teenage character for the movie, btw; there's photos) for the YA crowd (obviously out of response to how good The Maze Runner movies were, i guess)? You just can't. Again, that crowd DOESN'T CARE about Dora. AT ALL. This is a dumb idea that's gonna backfire "Oh, but we just cast Benicio del Toro as the voice of Swiper the fox!" So? That doesn't make things interesting, that's just more fuel to say I don't care (Del Toro's a good actor, but this is just a paycheck for him this time). Stuff like TMNT or Lego's is more universal, so those appealing to the older crowd makes more sense. Dora only had ONE kind of fanbase: preschoolers. She's not Carmen Sandiego, FFS. And don't tell me the "irony" crowd would want to see it judging from the above comment; it's not worth it, guys.
Paramount, Nickelodeon, just don't bother. This is dumb and a waste of money and you know it. The original show's been dead for YEARS and no one wants it back. If my point hasn't been clear by this point, let me make it clear now: NOBODY wants a Dora the Explorer movie, PG/PG-13 or otherwise. Nobody even CARES about Dora the Explorer AT ALL. We don't want this property back in any form. You could've made one 15 years ago when it was still popular to the targeted crowd, but you didn't! So why now? LET IT DIE. End of story.