Because everyone asked for it. Per Deadline:
http://www.deadline.com/2014/06/warn...ot-scooby-doo/

WB will do a dark and gritty take about a pup named Scooby-Doo who has his dad hit by a car sending him into a spiral of depression. He then ends up at the pound where a young boy named Shaggy adopts him. Later in life they meet three people who also lost loved ones in mysterious ways and together they band together to solve mysteries.


Scooby-Doo Begins
The Mystery Machine
The Mystery Machine Rises

I probably didn't see the second one, but which one was Isla Fisher? Did she replace someone?

I remember hardly anything about the movie, but apparently she was in the first one and was credited as "Mary Jane", I don't remember who that is, but she's certainly not part of the gang so I'm not really sure why the article mentions her.

Ah, with that name, probably something to do with Shaggy. Yeah, the wording made it seem like she was part of the gang.

I love Scooby Doo. If they aim for an older audience I think it can be good.

CGI has gotten better, so they could make Scooby a lot more lifelike if they decide to invest a few bucks...in the new Paddington film, for example, the bear looks really good.

I like the two with Sarah Michelle Gellar, Mr. Gellar, Linda Cardellini and Mathew Lillard. They were silly and fun little movies. I can't imagine a reboot being any better.

She's a blonde in the first movie, which is probably why you don't remember. Shaggy has the hots for her - get it? Shaggy falls in love with Mary Jane. Yes, this is the level of humor in the movie. Although, giving props where props are due, Matthew Lillard's Shaggy was pretty spot-on with the cartoon character.

Matthew Lillard actually does the voice in the cartoons now.

The Scooby-Doo movies and cartoons get rebooted every few years. WB certainly milks the franchise as much as possible. Last week I found a Muppets-style Scooby-Doo that I was unaware existed.

So, they cast a redhead to play a blonde, and a blonde to play a redhead.
I could have saved them a bunch of money on their wig budget.

They did the same thing with Mary Jane and Gwen Stacy in the Rami Spider-Man movies.

Well I'll give them the benefit of the doubt before I actually see the movie since I did like the first two.

For size:


More here.

She was Shaggy's love interest in the first movie. Her name was one of the few bits of adult humor that remained in the final cut before the execs at WB insisted that the film be toned down and made family friendly. Originally there were more stoner jokes, there was a running gag regarding the fact that Velma was a lesbian (which was the real reason for the awkward reunion between her and the guy that liked her in the first movie) and another running gag regarding why Freddy and Daphne always went alone to look for clues.

I'm actually surprised it's taken this long to reboot Scooby and the gang. I don't mind the two films that were made for just goofy fun films. I'd be interested in the reboot.

Technically, the TV movie that premiered on CN was a reboot. I think they even made a sequel.