That won't happen - why would you think that? I already gave players the option to PK enable themselves on almost all maps bar a few beginner maps if they wish but I would never make the entire game forced PK.

i saw a post about someone was cheating and it mentioned making the game almost all pvp. i was like "hold up!!"

The PK system allows you to change your chaos status to neutral (by default), guild vs guild, and all vs all on some non-pvp map. This is helpful during PK wars; someone who killed a player can be attacked outside pvp-enabled maps (except terminus) as long as his/her name is orange or red. This prevents the "kill-and-run-out-of-the-map" scenarios.