Couple things on that.
I don't think that a dynasty is impossible today, nor do I think there is anything wrong with wanting one. I just think many fans have unrealistic expectations of what it takes, and how much luck and circumstance is involved. Yes, the Patriots were the closest thing to a dynasty that we have seen in recent history - although they havent won one in 9 years now, even though they have still been good. I do think the league has become even more parity driven since then, and especially since the 90's era of NFC dominance. For awhile in the 90s until the Broncos broke through, if you werent the Cowboys, 49ers, or Packers, your chances were slim. It isnt like that anymore. Even in the 3 that the Patriots won, two Adam Vinateri missed FGs might have their fans asking today why Brady has only won the big one once. Like I said, a lot of luck and circumstance involved.
For example - the Packers of the late 90's were plenty good enough to be a dynasty. They had it all -coaching, offense, defense, and special teams. They were 14 point favorites to repeat against Denver and lost a close one. They couldn't hold a 4th quarter lead against Dallas in '95 in the NFC Championship, and then the Rice fumble was called wrong in '98 and they went home. Thats all it took for them to go from a potential dynasty to a 1 year wonder.
My point is this - there is nothing more that Ron Wolf could have done in the 90s to build a dynasty. There isnt a move he missed or opportunity he botched. It just didn't happen. Likewise today, of course the Packers are doing everything they can to win a Super Bowl every year - that is the goal, and of course we all want that. As does every team He's making moves that allow us to be consistently competitive every year, and that's all we can demand. There's no one free agent that is going to put us over the top, so to speak.