Permanent enriched would allow players to cap and max their gear far too early leading to reduced game longevity.
imo, fast-paced game is necessary to cater those who have busy and short time to play and this population, i believe is far larger than the current player base of this game. this will also give a chance to the newcomers to be at par with the old timers. the more the game is friendly to new players, the more players it will attract. the only thing needed to retain players is to have a regular content update like skills, costume, characters, interesting events, and other attractive stuff. (however, the current server i guess cant support the massive 1k vs 1k pvp).