Ehh... It doesn't bother me all that much. It could work, as long as they don't go overboard. If the story and characters are good, that shouldn't be an issue.
I find it funny just how many fans are put-off by this, when they were complaining earlier about "Sonic Boom" and the games being targeted towards kids.
Yea... but to make it as a PG-13 rating? I don't know it'll work. And I don't think the older audiences will watch something of a character design like that. It just doesn't fit that way. Sonic have been tows children, because of the character design like that and just look at Mickey Mouse? Imagine if there was a PG-13 rating film featuring the main Disney cartoon character?
I just hope that the writer and the film studios just change their mind and make it like PG rating instead. We'll see to that...
And yea... I used to dream to make my own Sonic project to be aim for older teenagers.. But I just realize I rather make it as a fan fiction then a real TV or movie project.