Yeah, in an ideal world I'd be all for hexes myself.
But even if the majority of 'wargamers' prefer hexes, look at gamers in general. Most would never play a hex-based game. And yet tile-based Civ 1...4, as mentioned earlier, are huge huge sellers. Imagine how badly a Civ game would flop if it was turned to hexes. The tiny, but vocal, wargamer community would love it, but not the guy walking into EBGames to see if there's anything interesting to play... And not even the guy browsing GameSpot's list of PC demo's. He wants tile-based.
Anyway, I have faith that Hubert will do a great job with tiles and that SC2 will be even better than SC1. And if it isn't, well ... it was only $25??