I really like it but I don't believe it will happen. Every player gets tons of shards for free as they progress through the game, rest of shards are very easily farmable and Mace is also quite easy to gear up. That all goes against making him great.
It is more likely to get second Mace toon. When new strong character is released, CG wants people to pay. Strong reworks are done only when there is bug in the game and fix will somehow nerf part of toon's kit so CG needs to make the toon overall stronger to avoid backslash from players who paid for the toon.