So what you're basically suggesting is... to adopt PVP matchmaking system similar to Wartune or League of Angels? Those battle rating numbers based on Hero strength? This is a big revamp you're suggesting, I'm not sure this is suitable for VF...
The problem right now is those inactive CBT players who's hovering at the bottom, an easier solution would be to kick everyone out of arena after weekly reset and leave a 'register for arena' option after that. If players are still at a safe point during reset, they drop to the next safe point at the lower tier. Sound good?
I've never played those games, but one thing I forgot to add was: the Arena Battle Power don’t need to be displayed! We players may not even know it exists, it is only there to make a fair system of matchmaking in the Arena. Maybe if people know every number they can start thinking in ways to exploit it (even though I think that it’s high improvable giving the way this system could work).
If you put it that way, I actually kinda like it. I'm not saying that what you're suggesting is bad, it is actually pretty good. The thing is it will probably take a long time to implement, and the newbies right now are at wit's end.
About your suggestion let's elaborate:
Clearing inactive players from the active matchmaking pool will lessen the problem with new players facing them, BUT, this is a workaround solution and not a definitive one this is not the whole problem, the matchmaking is not working as only matching players in the same level range. Let’s say:
Kid installs Valiant Force, Kid really likes Valiant Force and starts to whale a bit, and goes up in prestige before Player lvl 20. Soon he will get complete sets (4*, 5* and 6* ones) from prestige level gifts, soon he will get a complete 5* team, he enters the arena already powered, facing players that are taking their time to evaluate the game and determinate if they want to invest in it in the future (most mid spenders think like that). New player reaches Player Level 20 and the arena opens up, new player can be facing Kid in the arena and being totally smashed by him. New player think the arena is unfair and starts to think if he should really invest in a game that where he just started and is being slaughtered.
Eventually Kid will rise in the ranks, or he may think that rising in the ranks is a little too risky. Why? If he can starts losing before just before the rank up to stay on low rank and win with a steady rate?
Kid reads the forum or other communities and decides that is the best to stay at lower ranks to earn more blood tokens to change for valiant tickets (fact: if you can’t keep a good wining rate it truly is).
Kid becomes a cancer that the Devs can’t do anything about it, and when new players faces him they will think that the system is unfair and maybe even give up about that aspect of the game, how long till they also give up on other aspects?
Is Kid just an occasional type of player? Those types of players exist and I already see a lot of players thinking about doing that here in the forum.
I don't think anyone would go that far just to stay in the lower ranks, would they? Difference between ranks in the lower tiers are like 100 points difference. To keep hovering in the lower ranks weekly he would need around say... a dozen matches? I don't think a sane person would spend so much just to play several arena battles per week. It would take ages to accumulate enough blood tokens to get the good stuff then. Why bother spending so much just to slow your own progress in the arena? Just to get a nice win rate?