You dont always have to put together a big 3 or more to win. As evidenced by the Spurs, Mavs, Pistons of the recent past and other well balanced teams.
Just build a cohesive unit
Yes you CAN, it's not impossible.. but it's very difficult. For a situation like that you gotta basically assemble the perfect core and have all the stars align. Building a team like the Pistons had in the early 2000s is damn near blind luck, having all those guys break out together at the same time. That's not the kind of setup a franchise should aspire to be.
Even the Mavs, yea they beat Miami, but never made it out the first round again. Miami made the finals every year cause they had the stars.