I believe that Slanidrac, K-9, and conraddobler all have made some very good points. My feelings are that you are ALWAYS on the look to improve your QB situation.
We made a huge leap last off-season with the acquisition of Carson Palmer. He was head and shoulders above anyone on our roster, and though aging, he should be available to us for the next few years. He has won over our other players, and they will work tirelessly for him. That is very important. He has the trust of our coaches, and they have been very patient with him, and will continue that tact. He IS our QB of the now, (and the near future) for us. He can take us to a super bowl, (and win it).
That said, we should scour the prospects this year, both in free agency, and in the draft, and IF there is one who piques the interest of the FO and the Staff, we should make an attempt to acquire him in order to upgrade our backups. This study should be made each year, (though a selection should only be made if it is readily apparent that the player would be an actual upgrade). Thus, it should not necessarily be an annual event to take a QB, but the search should be made, and an acquisition made IF it is a believed upgrade to the status that year. Not every year will require an actual acquisition.
This has been pretty much the way New England has operated, and they have been successful. I am confident that Keim and BA have been contemplating this all along, and that they will continue to do so. This is the true function of the FO and scouting department, not just for the QB, but for the entire roster. We made something like 93 player transactions this past season. Each one was designed to improve our roster status, or to replace a player lost to injury etc. I don't see Heim, Licht and BA as ever becoming stagnant in working to improve our roster. That cannot be said of 'any' previous Front Office that I can recall with this team.