The pick you give up your hope would have been you get lucky enough to draft a player like Irving. You get him now and don't have to develop him for several years, and the BK pick could easily be 5-8 this year. I love Isiah Thomas, but I'd be fairly comfortable wagering that he will never be as good as he was last year. I don't think he will be worth a max contract, although he has earned it and that brew a troubled scenario when you factor in his size, age, and injuries. You get Irving in his prime, and you can make a good case at extending him. I'd take Irving over the next 4 year any day opposed to IT.
Yes we gave up a lot, but you have to give up a lot to get a guy like Irving. We still have Tatum, and Brown, and we still have some more draft assets that could pan out pretty well too. This team is still set up good for the future, but they will be able to compete now as well.