I'm not anointing him for anything, but I am not the coaches so that doesnt really matter. Just be patient and let him earn his way onto the field before judging him. Most on here, at least, are being hopeful that he will be a difference maker for the team. That's just what fans do.
Part of the reason that there are fewer instances of one-year starting QBs making it in the pros is because so few QBs get a chance to start to begin with, where guys with longer resumes end up getting more opportunities to play. To your point, one-year college starters carry more risk than others, yeah, but there are examples of guys succeeding in the pros in such circumstances too. Cam Newton was a one year starter, as the article pointed out. Kurt Warner was too, and look at how he turned out.
I would certainly be interested in a chart of the success rate of QBs based on how many years they played in college (where successful means a QB who was signed to a second contract and continued to play at a high level throughout it). Either way, given that most QBs amount to little or nothing, why not sit back and be hopeful that the guy ends up being a capable starter for us?