May be they are taking a break like before to make their MotoGP prototype as well as the production bikes competitive.The investment into MotoGP does not make business sense anymore for them as even the top manufacturers do not make any significant profit from MotoGP.

Therefore, I believe Suzuki is quitting because of one of the following two probable reasons. They or their comments are less likely to be the reasons since business cannot be run on sentiments. In comparison, Suzuki's GSX-R1000 feels quite dated. All of them and everything in-between like the Honda Fireblade and Yamaha R1M are loaded with the latest and greatest of race-techs to the brim. On one end of the spectrum you have the expensive Ducati Panigale V4R, BMW M1000RR and on the other end you have extremely value for money product like Kawasaki ZX-10R. On the other hand, their production motorcycles have been seeing steady decline in sales due to very similar reasons. It requires continuous investment to stay ahead in the game. Even when they finally delivered the techs like the Holeshot device and the Ride Height device, they are far less competent (especially the Ride Height device) than that of the others. Suzuki has been playing catch-up game with other manufacturers (Ducati, KTM, Honda, Yamaha and Aprilia) on the innovation front.

Motogp 21 forum