If we can avoid the good guys, we have a better shot at winning. This is a loser mentality.
Repeatedly playing a good team like Detroit not only makes for good entertaining games to watch (we the fans win here), but it forces the Hawks to up their game and it lets them know where they stand against elite teams in the league.
Dewsox likes to repeatedly point out that the Hawks fell ass backwards into the playoffs this past season and technically he's right. But go back and swap Chicago and Vancouver (putting Chicago in the weak Northwest division). You can't deny that the Hawks would have had an easier road getting into the playoffs than they did playing in the tougher Central. That turns them from a team that underachieved in the season and then maybe overachieved in the playoffs (odd to think that, but still...) into a team that had an acceptable season followed by a playoffs that was more disappointing than it actually was. Or hey, maybe they end up drawing an easier team like LA in the playoffs and advancing into the 2nd round. Then what do we think of this past season? It would still be the same team we're talking about, right? The team that we all feel had a shitty year and wasn't that great...
I know that paragraph is one big 'what if', but that's what we're dealing with here (what if detroit goes away). To be the best, you have to beat the best and quite frankly, Detroit isn't even the best. The Hawks are good enough to hang with any team in the league... there's no reason to hope for an easier road for them.