Depending upon the way that the negotiations for these properties would be handled I could see this being beneficial for both the Milestone Universe and the DCU. First and foremost, if Dwayne is actually considering the proposal then their has to be something good on the table - he's proven time and time again just how much affection he has for all of his characters and he would not sell them off for a quick buck. Secondly, if a deal is created where the Milestone team would still hold creator rights and be paid for their creations then I could see the deal working. Not only would characters like Icon and Hardware finally get a chance to shine but some of the team-ups with the DC characters would be great - say a redux of Superman/Icon.
Personally I can find pluses and minuses to both situations and I would not try and pressure Dwayne into either decision - primarily because I know whatever he decides will be the right decision for himself and the entire Milestone Universe.
"Never give in--never, never, never, never, in nothing great or small, large or petty, never give in except to convictions of honour and good sense. Never yield to force; never yield to the apparently overwhelming might of the enemy."
- Prime Minister Winston Churchill
"Si vis pacem, para bellum."