Open Stack

It would break Horizon.

On initial login, Horizon passes user id and password to the V2 API.  If
no tenant is specified, it gets s token scoped to the default tenant.

Even if it didn't, however, Horizon only holds on to the last token ,
and revokes all eralier, so you would break the ability to go from
project to project.

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https://bugs.launchpad.net/bugs/1299039

Title:
  Token Scoping

Status in OpenStack Identity (Keystone):
  Triaged

Bug description:
  In Havana Stable release for both V2.0 an V3,

  A scoped token can be used to get another scoped or un-scopped token.
  This can be exploited by anyone who has gained access to  a scoped
  token.

  For example,

  1. userA is related to two projects: Project1, Project2
  2. userA creates  tokenA scoped by Project1
  3.  userA  shares the tokenA to a third party (malicious).  
  4. Third party can now make a token creation call to create a new tokenB scoped under projectB using tokenA.

  Although, we know that bearer token has all or nothing property, scoping the token can limit the exposure. 
  A scoped token should not be allowed to create another scoped token.

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