The boot is a protective rubber cover, which is designed to stop dirt and dust getting into the ball joint, and wearing it.
As such, a tear is probably not immediately dangerous, no. But now that dust and dirt can get into the ball joint, and act as an abrasive in there. So the longer you leave it, the more damage you might cause to the rest of the suspension - meaning more expense of replacement.
In addition, worn suspension can mean uneven (and faster) tyre wear - again, that's something else which is going to cost even more money in the long run. In extreme cases, it can even lead to wear or damage to the steering rack.
A job which is better done sooner rather than later, basically.
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