I do think the modular theme has a long future, so I tend to agree. There are still so many different themes they can do and since they only make 1 a year, that helps from completely oversaturating the market. I don't care that there are 5 sets out right now. 3 years from now, more than likely 2 of those will be retired, and there will be 2 to 3 more on the market. By that point, the sellers that hold pet shop will be under 150, and I do agree that the overall modular theme will continue to grow in popularity. Lego Movie 2 could push it even further. I think this theme, the creator exclusive automobile theme, and the creator exclusive theme park will have a very active collectors market. Long term, your money is probably better here than in Star Wars and other themes. But, I do think there is a limit on the amount of people holding these and there's other factors at play. If Lego all the sudden were to make 2 sets a year, that could quickly start to oversaturate the market, or if they started rehash central... that would also ruin not only the third party market, but even start the downward spiral in the the collectible aspect of the theme(s). I doubt it gets to that point anytime soon though. Pet Shops, and even Palace Cinemas should be safe for some time. A rumored Hospital next year, that just keeps the wheel turning, and hopefully it's a big wheel because it will take a while to cycle back to these various themed buildings. A town still needs a post office, bakery, coffee shop, sushi bar, police station, dentists office, daycare, school, and an arcade. There's still a lot of time before they make it back to something like a pet shop.