I highly doubt it. First, Romo would have to be released by Dallas because he's under contract. Elway is not going to TRADE for Tony Romo. Second, Dallas is trying to trade Romo. If they succeed, Romo will be going elsewhere.
Third, Romo would have to re-negotiate his salary down to about 1/3 what he is making now. Would he do that when some other team would pay him what he thinks he's worth?
Sure he would like to come here, but Elway is not going to hire him. Elway believes in Paxton Lynch and has just hired a staff of veteran offensive coordinators, like Bill Musgrave who was OC in Oakland. They are paying these guys a lot of money to mentor and tutor Denver's young QBs.
They did not pay Musgrave all that money to coach up Tony Romo. Romo doesn't need it.