Re: If the Steelers put Ben on the trading block....
To answer the OP...
If somehow he were actually traded, it would take three R1 picks to even make me consider it... and one of them would HAVE to be a top-ten pick. Even then, I would not necessarily do it. Why? If it was last year's draft, with several franchise QBs (Luck, Wilson)... maybe... but, I do not see any QB of that ilk for a few years.
Aaron Murray... maybe... but, he is not Luck or BB.
Nope. You only have a shot at a franchise QB once per every few decades... unless you are the Niners (Montana, Young) or the Colts (Manning, Luck). Thus, I gotta stick with BB. A "bird" in the hand is worth "three" in the bush.