I think a legacy level boost would be a great idea. I had 3 ideas on how this could be implemented or choices for people to choose from.
1. make it a cartel market booster like the minor or major exp boost but just legacy level with maybe a 100% up to 500% legacy exp boost.
2. offer an automatic boost as you get more toons leveled through chapter like the class emote and heroic moment -- make it a 10% boost per character reached chapter 1,2, and 3 maybe even finishing the makeb quest. it would show your legacy is learning and growing like a grandfather teaching is grandson.
3. a character perk or legacy other ability bought with CC or credits on your legacy like buying the exp boost and the global legacy unlocks. this a great way to spend my CC or credits that I have enough to waste now.
this is just an idea that thought would help to encourage players to create more alts. I really enjoy the legacy and hope for more perks and additions to the legacy overall.
any other thoughts or ideas please list here and lets hope someone from Bioware is listening. would really like this!