[WOTLK] Turn 5v5 into Rated BG

Hi there!

I was just wondering about an idea of turning 5v5 arena ladder into rated BG-like feature. I do not know if it is possible technically wise, but the idea is to replace the array of arenas with array of 10/15 man battlegrounds after you join the queue for 5v5. As far as I know you can have more than 5 team members in your 5v5.
How it should work:
1) create 5v5 team
2) invite 10-15 ppl
3) queue
4) the queue system will not queue for arenas [array of arenas], but for battlegrounds [WSG, AB, EOTS]
- if 10 team members are in a raid group, WSG pops
- if 15 team members are in a raid group, either AB or EOTS pops
- maybe it is possible to rename 5v5 text into Rated BG

edit: this would solve 2 problems:
- lowbies are not gonna QQ about getting #REKT by lolmournes
- lolmournes are gonna face fair competition
- bonus: full premade on both sides, real competitive gameplay