Yes, it will probably get worse with more kilometers. The gear kicks out because the engagement dogs (male) and slots (female) have ever so slightly rounded off the originally square corners. This is a common problem (not only for Suzuki), especially with less-experienced riders who clash the gears when shifting.
If you avoid high rpm in second gear, it should last a long time. The only fix is to split the engine cases for new gears. Which can be rather expensive…
I have a 2004 Suzuki GSX-R600. When I rev it high in second gear, the transmission will kick into neutral. I’ve tried to keep the rpm limited in second gear since then and haven’t had any other gear issues. Could this lead to a bigger problem in the future?