I am not at all worried about the Phillies doing anything in response to Hoskins, let alone overpaying for Machado, which they would be doing by definition if they tried to acquire him at any point in the next six weeks. Plus they just made it through May without Hoskins doing anything. Williams, and hopefully improvements from Kingery and Crawford, will be the focus for June.
And if they do start to trend towards .500 and five or six games back, they're not going to make trades to try and reverse that. They need to keep winning to be a deadline buyer, and if they keep winning they're not desperate. If they falter, the move is to just keep playing your rookies and second-year guys, not to replace one of them with a rental player in hopes of adding a win or two. Of course you still keep an eye on Machado, but he remains a longshot, and a pitcher is probably the bigger need (two weeks ago it looked like Eflin had something and Eickhoff was at least someone who would make a few starts when the need arose but now neither of those things is true).