There's a fairly easy Ponder replacement in Magic 2013 (maybe not as good overall, but does still help Delver in terms of the "reorder your library" department). As for another cheap cantrip, there is always Think Twice...or maybe even Fleeting Distraction.Remember, M12 will be rotating out as well. Delver loses Ponder and Mana Leak, which are huge, as well as Gitaxian Probe. To exist post-rotation, there needs to be another good cheap cantrip, and given the problem's Ponder's caused, I don't see that happening.
I think you may be overestimating the importance of Mana Leak. A lot of Delver decks have dropped to three (presumably because of Cavern of Souls). It's not like there aren't new or already-existing counterspells that can take its place.
I was trying to say they could be reworked into Ramp/Aggro decks. That is, you don't have to ditch the deck entirely.No, a Pod deck is a reworked aggro deck with a bit of a midrange plan. (How much depends on the build) Look at the Naya Pod or Zombie Pod decks that've been doing well recently.
How long is "in a while"? It got first place at SCG Worcester, which was less than a month ago. It also got a Top 8 at SCG Indianapolis, which was mid-June.Last I checked Solar Flare hasn't done well in a while.