There is too much fatalistic thinking about the Warriors. Keep in mind after the Celtics won the title in '86 and had a lottery pick on the way people expected them to dominate for years. Larry's bad back, McHale's broken foot and Len Bias's overdose changed all that.
To take a more recent example... after the Celtics got waxed in the ECF just a few months ago many of us were thinking we'd never sniff the finals until Lebron retired. In short order reports came out that Lebron would likely leave the Cavs in a year and Kyrie demanded a trade. And voila, the Celtics might now be the favorites in the East.
Point is, don't make assumptions that teams are unbeatable. These things change, sometimes quickly.
Plus, there is almost always a superteam. Before the warriors it was the Heat with Lebron, Wade and Bosh. Before that, it was the Lakers with Kobe, Bynum and Pau. Before that, it was the KG/Pierce C's for the year before KG got hurt. Before that, it was the Spurs. Before that it was the Kobe/Shaq Lakers. Once this Warriors team fades away it will be someone else.
If you don't have one of those top 3 players and a great team around him, you're always going to be looking up at the team that does. But year to year anything can happen. All the teams before the Warriors have had years where chemistry didn't click, injuries hamstrung them or they just had a bad series in the playoffs. That's where the lesser contenders like the Mavs and Pistons can catch fire and win a championship. I think it's better to try to be that team for the years that you can than to try to wait for the current superstars to get old or superteams to break up when they will be invariably be replaced by the new superstars.
And who knows, maybe Tatum or someone will end up being an MVP caliber player in the NBA and in 5 years we will be that team that looks unbeatable.