Well, I consider myself an optimist, so yes. In support, I offer two items:
The Hero Quest petition has gathered a lot more signatures than the Heroscape petition. It now languishes just under the halfway mark: 1,190 signatures, 1,310 still needed at the time of this post. It could be pushed past this psychological barrier if some of the unconverted HQ fan sites in certain countries would join in. (The Italians rejuvenated the petition by jumping the total more than two hundred signatures in a couple of weeks.) Most sites have already added significant support, but getting past halfway means the number of needed signatures is more concretely seen as decreasing (the bar graph with the petition shows this). The combination of several hundred extra signatures from as yet unconverted countries and a shrinking net amount to complete the petition might be enough to provide further momentum and complete it. Like I said, I'm an optimist.
The other item is anecdotal, as I can no longer find the original thread (really). I remember a couple of years back reading about someone (Skyknight? Truth?) connected close to the heads of the games research division at Hasbro. These company insiders were superfans recruited from the Heroscapers site. When asked if Hero Quest could ever be brought back into production in some form, the reply from one was characterized as a whistful "We'd love to see that happen, but the right people have to be convinced first. I'd say chances are 50/50." That was only quoted from memory, but I'll never forget it--50/50! That response has made a believer out of me.
A completed petition with 2,500 signatures might be just the thing to create notice and help convince corporate that Hero Quest could again be supported by a viable market supplemented with a nostalgia niche. Those friendly to the cause already work at Hasbro. If we don't get the game back, let it not be for lack of effort on our part. I commend you on your letter campaign.

If Hasbro had gotten 1,190 of those, I'm pretty sure we'd be posting about the new game on the shelves.