One of two things:
1) They come back in the 1970s as people realise that you can't go around tight corners with large engines without some sort of aerodynamic aid. And considering most of the tracks in Europe at the time had tight corners (without chicanes), it's going to come up.
2) They don't come back, and F1 evolves into NASCAR-style oval tracks, which are the only way to go fast without wings.
Either way, you're going to end up with even more dead drivers as the teams push wingless cars further than they can safely go.
And, FWIW, what was banned in 1969 was wings mounted to the axe, which provides more downforce, but it more dangerous if it comes off. All aero surfaces since then have to be attached to bodywork, and thus transmit the downforce through the suspension, providing some give in case the wing falls off.