Honestly, as long as they take an interest in a musical instrument I'll be happy. And my eldest is only 3 so I have plenty of time yet to educate them as to what gear they'd need.
I only let my kids look at and play them, not just any old random child. And they're not left out all the time for them - I'm not that silly. But there's normally one left out in the morning that they can see when they come down for breakfast. Then the case gets closed and it gets put away! But on the rare occasions that I get a guitar out when they're around, I'm quite happy for them to come over and have a go at strumming and flipping the switches. I don't want there to be any mystery or barrier for them, and just how much harm can they do to a Strat anyway