Do you think without commision staking, Will arena die?

There are still odds stakers that use the arena. They're actually happy commission staking is gone.

 

Commission Staking leaves many users vulnerable to scams. Stakes can be rigged, and money can just be flat out stolen. If Jagex wanted this to be a part of the game, it would be. 07 / RS3 swapping allows players on 07 to buy bonds for membership, which ultimately brings in money for Jagex. So they've allowed these swapping clans to continue. Stake clans, however, provide very little in terms of value to Jagex (if anything), so they're an easy target for removal. They're similar to dicing and flowers clans of the past.

 

It won't die, it'll just go back to how it was before, with odds staking.
The number of people max main staking will for sure go down though.