Show token usages/dynamically change token names in existing campaigns/assets

It would be great to have these feature available:

1. See if a token is in used in any assets or campaigns

2. When changing a token name, token names are dynamically changed in assets/campaigns. 

Pain point:

If I'm to refresh token naming conventions, there's no way to know where the token is used. And since token name doesn't change dynamically in existing assets/campaigns (as opposed to the process of email name change), it's very likely that I'd miss some assets/campaigns, causing the old token to stop working.