I saw solo ranking in Bloodline champions. It was based on w/l ratio and it was influenced by series of wins/losses. Won't work in SWTOR since there were 3v3 or 2v2 fights in BLC. 8v8 makes your impact not so noticeable. However if it would be based on the other metrics: inflicted/guarded/healed dmg, interrupts, ball carrier kill, capping turret, placing/defusing bomb, pass/score in a successful goal run, etc. -- it might work fine.