"Something happens"? If the suspension parts are damaged they could actually break, and basically the wheel falls off. Probably not a good thing to wait for.
You can just let it there until something happens. Lets see, something did happen, the lower arm and link were bent. So not it is time to fix it. The arm or link could break, you may not be able to make the car head in the direction you want it to, and the tire will wear out much sooner.
Something has already "Happened". You have thrown you whole front end out of whack. You need to get it fixed before you drive it again..It is unsafe, and you will wear out your tires, If something else breaks you could loose control and crash.
The damage will adversely affect the car's suspension which may result in unsafe handling and rapid tyre wear. In the UK it would be considered unroadworthy and an mot failure.
Recently, my front tire car was slipped into a drain and foremen said the lower arm and link was bent. Can I just let it there until something happen? Is it that necessary to fix it? Thanks.