The Scooby-Doo franchise has continued after Mystery Incorporated with Be Cool, Scooby-Doo!, which began airing in October 2015.
So the answer is yes, they will continue it. The Scooby-Doo franchise will probably outlive us all.
As to the specific artistic style implemented in Mystery Incorporated, historically, Scooby-Doo has used multiple styles, and has never reverted to another style after it has been changed over it's 49 year history.
From statements made by a producer, it's not likely, as art was changed to match the newer light-hearted presentation:
Zac Moncrief, a producer, called it "a more comedic ensemble", with character traits extracted from the original 1969 series. This decision nulled the romantic subplots present in Mystery Incorporated. Scooby-Doo will also have limited dialogue. ... In addition, the series employs redesigned characters models for the cast (retaining their original clothes, with a few design tweaks, e.g. Velma and Daphne wearing short sleeves). Moncrief described this as a "simplistic, edgy design to match the comedic styling".
The newer art style is IMHO closer to modern day 2010's cartoons (Adventure Time, The Amazing World of Gumball, Rick and Morty, Teen Titans Go).
There's no accounting for childrens' taste.