Pattabhi Jois, the father of Ashtanga, was notorious for rarely giving straight answers to questions. Whether it was a language barrier or just his cryptic charm, he would often respond, "Do your practice and all is coming."
Some interpret this to be a transactional statement, that Guruji was promising that you would attain what you desire over the course of time, so long as you continued to practice Ashtanga.
Instead, perhaps he was really saying, "Do your practice because all is coming."
In your practice, you will face adversity. You'll fall. You'll be asked to do things you can't do. You'll face injury and embarrassment and learn a lot about yourself in the process. This is good training for life.
Yoga doesn't promise that you'll master handstand in your lifetime. But it does promise to better prepare you for the things that actually matter that lie ahead.
All is Coming?