A server wipe would take a portion of the CBT players out and a new server would dilute it resulting in multiple shell servers.
They only need 2 servers.
The current one for the CBT crowd, the other for us starting out from official day 1.
Honestly , a full wipe would be the ideal solution.
This way, they could rebalance gem rewards from stage completion and dailies ( they give way too little compared to other mobile games).
No. I don't know who the "us" is you're speaking for but your solution only favors what you want. I apologize if it hurts your opinion but its a fact.
No new player, who has done a little homework, would want to join the CBT server for the very same reasons you want a new server. What this entails is a slowly but surely dying CBT server with little to no fresh blood joining.
Everyone would want to flock to the new server for a fresh start, players from the CBT server would head there too and "whales", as many would call them, would dominate said new server with their money, pull ahead of the pack and people would start leaving.
Next thing you know, you would have 2 dying servers and resort to opening a 3rd. Rinse, repeat and you'll have multiple servers with less than half the capacity each.
(Which is exactly the same reason that is plaguing FunPlus' other game Dot Arena)
Wiping might indeed be a better solution but there is a huge risk of pushing away players who have committed time and effort into the game.
Gem rewards are pretty good right now imo. With only a single monthly card purchase, I've been able to earn ~3600 - 4000 gems at least with stage clears, achievements, arena milestones, events, etc.
What other mobile game might you be referring to?