Convert webform submissions to Drupal 7.x entities

Drupal 7.x have Entities, that can store custom data with fields, so Webform now can store form submissions in entities instead of his own format.
Now it duplicate entity functional with his own submission item object. If we move this objects to entities, Webform solve many problems:
1. Submission view page, edit, delete in Entity API module, so we can remove duplicate code from module.
2. Support for Views 3.x, we will got access to any submission field, so we can solve issues with Views support requests.
3. Support for submission cache and many third-party modules.
4. Support any field type in form, not only build-in into webform, so we can remove duplicate code from Webform modue.

What do you think about this idea?