Sony has plans for an animated Spider-Man movie in 2018. It will be released alongside their Marvel co-op movie and their Sinister Six film.
http://www.comicbookresources.com/article/sony-announces-animated-spider-man-movie-for-2018
I wondered about the viability of such a film but on reflection, I don't think it will take away from the live-action series. I would consider the 5 live-action movies to date a bit scary for my kids (aged 8 & 5) but would take them to see an animated film. Mind you, given the involvement of the people behind the Lego Movie, I sort of wish that this was a Lego Spider-man (but maybe Lego Batman has that market covered).
The fact that I'd quite enjoy the animated movie is obviously only coincidental.