I dont support 7th suggestion,BG's actually give life to server and keep people "in-combat" imagine if players dont have a motivation to queue BG what is going to happen,if they do that population will go in bottom for sure!Also,lets be honest ok there're still many many hackers in BG's but now anti-cheat system founds them easier. Moreover,dont forget that there're many hackers at arenas too.
Now lets go at 8th suggestion..Well,I support 100% this one because I believe that staff need to promote Rated BG's with some kind of events like Adlairo said or just with some auto broadcasts announcements