The 'tycoon' genre seems to be on something of a downturn lately (at least in terms of quantity of titles) but I think there will always be room for a new entry provided it meets the player's core needs: is easy to play, rewards them quickly with accomplishments (makes them feel like a superstar) and has some depth for replayability.
Demolition Tycoon would see the player starting out as a teenager looking to make a few bucks by assisting with small-scale renovation projects. Demo your grandmother's aging shed in the backyard using nothing but rudimentary tools and brawn. Earna few bucks and you can buy some tool upgrades (sledgehammer anyone?) and move on to more challenging projects -- a neighbors' kitchen wall, etc.
The joy of wanton destruction is paired with the entrepreneurial spirit that makes the tycoon genre so popular and could create an interesting dichotomy not often seen in competing products.
As the player advances in the game the choices could start to include personal preference -- when demolishing a skyscraper, do you choose a wrecking ball, or explosives placed on the building's supporting columns? The opportunity for fantasy destruction, too, is endless.
A lot of gamers probably list 'seeing things blow up' as an important source of entertainment, so why not let them feel a little virtuous while doing so?