It's too early to say but I think we will still see the Golden State Warriors in the 2020 NBA Finals. The Toronto Raptors did a good job in winning the 2019 championship and will still be a contender next season. However, the won their title against an incomplete Warriors team. I believe GSW will bounce back swinging in all cylinders for 2020, unless they suffer from injuries again, hopefully not anymore.
The Lakers though are a serious contenders for the title as well. LeBron now has a very versatile big man at his side in Anthony Davis. We are looking at two of the greatest players the NBA had ever seen and now they are in one team - and they are BIG. To really strengthen their claim for the championship, Lakers still need a super point guard. With Irving, Walker, Rozier, and even Derrick Rose available in free agency, they have an option to form their own big three.
For sure, the 2019-2020 season will be very interesting.