We'll the side issue with the receiving crops is Alex Smith just hasn't ever made a WR look better than they really are. If you think of the elite guys they all take average WRs and make them look great. In Smith's entire career he's never done that. I think he's had WRs do well, but those were always individually talented guys like Hill, Crabtree and Maclin, but they never had their 'big season' with catching passes from Smith.
IMO Kirk could sort of do that, which makes this entire corp look worse.
Anyway, unless something changes there will be some dark days ahead.