At least for me, the Romans is exactly what got me back into PM again after 37 years. It's really sad to see that Geobra will no longer "support" the theme, but I can easily understand the reasoning behind why they axed the theme (the same goes for the Egyptians).
Let's face it, of every $100 spent on PM around the world, how much do you think is spent by adults like us? Five bucks at best? I would wager it would be a lot less then that overall. And for young kids, the big majority of the target audience for PM that were not exposed to Romans or Egyptians in the real world, these themes are NOT interesting. Why is the Pirates theme a big hit? Because of
Pirates of the Caribbean. As much as I enjoyed
300, my 4 yo will only watch it many years from now, so what he knows about Greeks and Spartans is exactly zilch. But if you ask him about Romans, he knows the difference between a centurion and a decanus, but that's because I've read to him every single
Asterix book every night. But even among the Roman lovers here on the boards, who reads
Asterix to their kids
?
If kids don't get exposed to the theme through some form of media they like (TV, movies or books), they will have no interest in having toys in that theme. Geobra wants to make money, so they produce what sells. Geobra could start making Roman forts and houses and war machines and new siege towers, and the theme still would not be a hit. If it doesn't sell, and here we're talking about at least 95% of the public who buys PM, they will not produce that specific theme.