Doc,
Lakers made the finals 7 times out of 10 between 2000-2010 and won 5 of them, Heat did it 4 times in a row, Spurs were there 5 times in 12 years and won 4 of them. Noone complained about seeing those teams in the final. So what's good for the league, Lakers-Celtics have to be there to make it less boring just because they were historically best teams? Warriors won their first title just 3 years ago, Cavs won their first in their history only a year ago. If anything, i think that's good for the league. It shows the other teams that if you draft well (Curry,Green,Klay or Lebron,Kyrie) and add one piece (Durant/Love), you have a shot at this. I think it's encouraging for other teams and good for the league that there are new teams that are relevant.
Regardless, you found it boring and it's your right but each year TV ratings got better, so maybe it is working.