No, you're not.... In 2-3 years, Sullinger and a combination of Embiid/Wiggins/Parker/Exum/Gordon/Smart and the #17 is going to trump Love and be in a much better position to win a Championship (assuming that is the goal of acquiring Love - not just going into the 2nd or 3rd round into the playoffs).
Is a lineup of:
Rondo
Bradley
Green
Love
Faverani (?... Although I assume Ainge will make a followup move for an Asik)
truly a title contender? The team will win... They figure to be a solid team in the EC, but are they truly built for title contention? Are they that much better than:
MIA - James, Wade, Bosh?
WAS - Wall, Beal, Nene?
CHI - Rose, Noah, Gibson?
IND - George, Hibbert, Stephenson, West?
ATL - Horford, Teague, Millsap?
TOR - DeRozan, Lowry, Valanciunas?
Except for the Heat, those teams have young cores that have just got the taste for playoffs. If you're giving up the most valuable pieces for Love... you're riding with this lineup (and/or variations of this lineup with comparable players) for at least the next 5 years. Sullinger is vastly underrated here (I think he's going to be a star), if one of the draft picks develop into a top 50 player (which is not farfetched by any means), the team will be true title contenders in 2-3 years.