Yep, definitely a good idea, assuming Hasbro's never going to make a large scale "ultimate" playset. I'd rather get it all at once, but Hasbro's been afraid of making a real playset since, oh, about 1980 (actually, that was Kenner back then). Well, there was that Bespin Freezing Chamber thing and a couple Theed sets, I guess... Anyway, I'm always perplexed with Hasbro can pump out monstrous playsets for the Batman and G.I. Joe lines, but freaks out at the mention of doing something similar for their Star Wars line. Makes absolutely NO sense whatsover to me. They hinted at C3 that they're finally starting to discuss doing some nice playsets in the years to come, but since they've farted around for so long, Attakus is going to beat them to the punch with their high end metal dioramas. So it'll be interesting to see how Hasbro attempts to compete against something like that. Obviously, they'll have the price factor working in their favor.
But modular sets are something that the collecting community's been requesting for years, really since the very early years of the line. Seemed like Hasbro might be on it's way to doing something like this, back when they put out the Death Star Escape and Detention Block Cell mini-sets, but those were the first and last of their kind. Had the Endor Bunker and Hoth sets too, but again, those were tiny, and shortlived.
I'd like to see some "modular" sets done on a little bit grander scale though. I'm thinking something more along the lines of what Muftak does with his customs - one nice level at a time for the Death Star, and let it grow upwards if so desired. But I'd take some interlocking one-level sets too, if they really created an accurate layout for a piece of the Death Star(s), Cantina, or Jabba's Palace. The question is, would Hasbro need to go with a cheaper ($20) price point and a playset of lower quality so the supposed kids could partake, or could they up the stakes a little and make some real nice connecting pieces catered to the adult collectors, at a $30-50 price point? I'd definitely prefer something along the lines of the latter, though I'm sure Hasbro would prefer the former.
I just want something that looks fairly accurate, and is close to a decent scale, so we can
finally display our figures in some of the more iconic scenes from the movies. That's not so hard to ask now, is it?

Oh, and just stick with the Original Trilogy too, at least for starters. Pump out the Death Star I & II, the Cantina, and Jabba's Palace and I'll be happy. Then maybe they can do something for Dagobah, Bespin, and Hoth too. After Hasbro's tackled all those environments, then they can fiddle around with the Prequel stuff.