Well by "right now" I mean today and maybe for a few days until we see the effects of today's NYT's front page story. We can't anticipate fully how the man on the street investor will react. We need new people to enter the market for it to climb, and this scares them off. But if we see that we're still just wobbling sideways like we have been for a few months now, then no reason not to buy these dips.
And as you say, for the long run anything we buy now will have been a bargain. So if you planned to hodl and you've already been dollar cost averaging in, no reason to stop now! I'm speaking more to people who've been intending to enter the market but haven't really yet. Now would not be the time to start given the very high uncertainty and weak stomachs among newbies for such intense losses that may occur right out of the gates.