@redking44
Many Joe Public participate in business. If I can gain access to your home wifi via WEP, I stand a good chance at gaining access to your business wifi or at least business information. Some people share passwords and other have confidential docs on their drives.
You are correct that legacy equipment will still work just fine. Unless very old, laptops should have no problem with WPA2-AES. My wife has an old DELL B130 (PIII) and it works fine with WPA2-AES. Its just that after a while APs and devices will only work with WPA2-AES or whatever comes next.
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