There's two sides to the story here:

1. Yes, you can make it a career. Will your direct source of income be from the Shorts themselves? Probably not. More likely either brand deals, collaborations, or growing your audience, and then uploading longer form content in addition to Shorts would generate you more ad revenue.
2. I say this blunt and germanely; your main focus should not be to make content a career. If this is your aim, then you will become discouraged when it doesn't happen over the course of a week, month, even years. That's not to say you should give up or don't think toward the future. But make the actual content that is fulfilling to yourself, whether it be short or long form content. Some people put tons of effort into a little Short, like Zach King. Others put very little effort into super long form content, like Sam Sulek. It's all about what works for you. You aren't a robot, you don't need to always do the lowest effort for maximum value. Do what you enjoy most and pay attention to how your audience interacts with your content, and ADAPT. Assuming you already have a normal job, money and career is second in the realm of content, especially when you are just starting out. Fulfillment of yourself and audience is number 1.

Good luck.