Wilson, though less prototypical, has shown in huge situations that he is able to win and be the reason for the success. His D has been very productive, but he has shown that he can make key, clutch plays under pressure. 20-11 TD/INT in playoffs.
Drew Brees. Again, despite his age, he seems to be rolling. Despite leaning on his D more during this season, in the playoffs he came up huge to lead his team to one win and (if not for foolishness) another last weekend. He is accurate and a good decision maker. He is a SB champion and doesn't seem to be slowing down.
TFB. No explanation required. I can easily see Brady having more productive years ahead (compared to Luck) despite his age.
Your question is somewhat flawed in the sense that "there doesn't need to be many better candidates for someone to be poor" as I think the quality of Qbs in the league is down. That COULD change if players such as Goff, Wentz, etc prove themselves.
Honestly, I'm surprised at how many on here value Luck so much...