I think our future relies on our luck in the draft and if we're lucky and we stumble upon a Harden or Love situation again.
You said it yourself, we tried to get another star to pair with Rondo and we couldn't. All those assets we have will only be good for us moving forward if we turn that into a player we can build around. We already tried to use some of those assets to land Love to no avail. We tried to use it to land Asik to no avail. Teams are not just going to trade stars unless they don't want to pay them or they want out (which is risky in itself). If the NBA stumble upon that situation, then we're in prime position, but we need to luck out on that. We cant attract FA's here unless we overpay, and we could certainly not attract a superstar to sign with us as our winning situation is, well, we don't have a winning situation.
The only thing that can help us is land a future franchise player in the draft, and to me we can get a high chance in doing so if we land a top 3 pick. That's the easiest way we can turn it around. Six first round picks in 2 years mean nothing if it doesn't turn into a player we can call our foundation. We can probably get starter level complimentary players with those, but we need to win the draft, we get a disgruntled star player or a cheap owner to get our next franchise guy. That's the only way we can turn it around. We cant get either of the three, then expect a decade long of mediocrity.