Past history shows teams that lose back-to-back conference finals don't take the next step in the following year.
In back-to-back seasons, the Minnesota Timberwolves have reached the conference finals. It has been their most impressive stretch of two seasons, as before that, they only reached one conference final in franchise history. The team is still looking for its first NBA Finals appearance, though, and it seems they are on the precipice of doing so.