at least we have made the playoffs in last 12 years

Not at all, reasoning is beecause it's highly highly unlikely. Less then 30% late first round picks ever turn into a permanent NHL player; that's really low odds especially considering it's in exchange for a 23 year old top 6 winger with 2 years left on his deal and then a RFA and a top 4 defender signed for another 4 years. Hawks would be crazy to take (2) late round firsts, each with less then a 30% of hitting on the roulette wheel and Buffalo would be crazy not to accept that offer.