As long as you are aware and ready to wait... Well, I guess this can be a good strategy.
I also think that low prices are a good buying opportunity but it may no be so easy..
The situation has been presented to ourself multiple times already so I don't know why it may not be that easy. If you have the funds today then why not? Purchase today and have patience and wait tell everything is back to normal. When I say normal, investors are back and they are not that reluctant to shell out more money into the market. Yeah, good strategy specially if you are going for a long term hold.