You can not change your Wii's boot2 compatibility.
Priiloader is very useful in case of a brick. You will be able to recover from a a lot of bricks still.
Just with bootmii installed as boot2 you can recover from almost any brick. Bootmii as an IOS is still useful to get a backup of your nand, in case you can not recover with Priiloader, you could get someone with a flasher to reflash your nand.