I know its unpopular but I am in favor of a wipe. However, to reward veteran players give vanity items or even unique power lvl 10 armor for those tough to get D2 items and triumphs. Have some items re introduced in D3 in whisper type dungeons. The chase for all new items keeps people playing and I think increases the playerbase. I am not saying wipe everything out, its good to have loyal veteran players. A company cannot survive on veteran players alone.