Well... ripped boot lets grease out... and maybe worse - contaminants in. Will shorten the life of the ball joint. But replacing is a pain...
If you chose to let it go - check and grease it more often... both to replace grease that leaks out - and the fresh grease will push out any contaminants.
Not sure if you can just get a replacement boot - if you can - can extend the life of that joint. But still have to take apart the ball joint to replace the boot. The 'fork' tool to separate the joint is a requirement for cars - and I suspect even more so here. Tried doing tie rod ends on an old Dodge without it - gave up and rented the tool which then took about 30 seconds to separate it.
I expect it will be a pricey repair to have done - unless your warranty or service plan will cover.
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