There's always a chance (except in the NBA)

Different franchises to win a championship, by sport:

NFL
Last 10 years: 8
Last 20 years: 13
Last 30 years: 15

MLB
Last 10 years: 6
Last 20 years: 9
Last 30 years: 17

NHL
Last 10 years: 7
Last 20 years: 11
Last 30 years: 15

NBA
Last 10 years: 5
Last 20 years: 8
Last 30 years: 8

So, in the last three decades, roughly half of the franchises in baseball, football and hockey have won a championship. Only a quarter of the franchises in basketball have.

But next year is a new season! Anyone has a chance to win it all (provided you’re in Miami, LA or Texas).