If I were GM, the next 5 weeks will determine a lot. They have a 5 week window until the 7/31 trade deadline, but I'd have my front office team have numerous scenarios in motion, including scenarios in which the team is a buyer and scenarios where they are sellers.
A 7.5 game lead is not insurmountable by any means, as I'm getting the feeling that Cincy and St. Louis are not going to run away any time soon. As GM, I have to realize the contracts I've handed out over the past 5 years are really biting me in the rear right now; however, if someone is willing to take Fukudome off my hands, all options must be considered. The level of prospect(s) rec'd in return will be directly impacted by how much salary the organization is willing to eat, an issue which will need to be discussed with ownership.
Realistically however, the organization should have a decent idea of how to proceed at the 7/31 non-waiver trading deadline by the 23-24th of July. But in order for the Cubs to become full fledged buyers, they need to have a 2.5-3 week hot streak.