Golden State had a tough time beating the Cavs last year with 7th men surrounding Lebron. Melo operating without double teams will be unstoppable.
They can play him 30 minutes a night, keep him fresh and he will get them 24pts and he will be so motivating playing with Lebron.
It will take about 5 minutes to convince him when Lebron tells him he will showcase him and the two will go on an international tour this summer sponsored by Nike all over Asia as NBA Champions elevating his brand to heights it will never reach while missing the playoffs every year. Ask KG about all those wasted years in MN.
Of course you need to be worried giving up a top 15 player. Rebuilding takes forever in the NBA, and rarely does it actually work. Don't want KP shouldering the load for too long. But, if we miss the playoffs there is still limited talent for us on the table. Batum makes you better, but he had two all stars, Looez and Wes Matthews and the Blazers weren't contenders.
If you have two great young players and can add one or two good assets this summer. I like our chances of going hard after curry, griffin, Westbrook etc in 2015.