I'm gonna have to respectfully disagree bichopapao. If we're going to add new affixes (well, technically they're already in the game, they're just so bad that no one notices) then they should be something that can be built around, not something that is equally meh for everyone.
I really do love the pickup radius idea, and I think implementing a +% pickup radius for many AoE skills could be fun.
Making thorns scale with main stat simply doesn't work for a myriad of reasons.
1. Thorns only returns melee damage, not ranged. This alone will mean that it's never something you can build around, or even be terribly useful.
2. Only Monks and Barbarians really TRY to get hit, and monks main stat, and MANY skills scale NEGATIVELY with thorns, because when you dodge, you don't get hit.
3. Everyone, and I mean EVERYONE already stacks main stat and has a VERY similar amount of it in each economic strata. This means that thorns will be equally useful/bad for just about everyone meaning that we are essentially again taking away any CHOICE to be made in the matter. It either is good, is bad, or is a decent bonus if the other affixes are nice, but nothing that one group will choose over another.
As for bleed, it has similar issues, though, since it's a proced effect, some skills/builds will be FAR better for it, meaning that it's already got some interesting build options (CM wizard, it's great, Archon wizard, not so much. WW barb? Yes please. Hammer Barb? Couldn't care less.) It also scales naturally with AS, giving some gearing choice.
Long story short, bleed and thorns are a different source of damage, and could just be another whatever bonus on top of the only strategy that currently exists, which is do TONS OF DAMAGE WITH SKILLS! Or, blizzard could make them into completely new gearing options of their own, which is really the only way they're going to be interesting.