You gotta love politicians, always want to leave a legacy. Good luck to her in turning Toyosu into anything more than the tourist haven it has become.I agree in that it doesn't seem so economically practical.
I've worked on some projects that Koike is pushing on, such as the Ogasawara Airport,.. and to me, a lot of her infrastructure initiatives seem more about leaving a legacy behind, rather than actual benefits and needs.
Based on the reports. she wants to make Toyosu, and perhaps the entire Koto ward some kind of mega center for economic activity.. rather than just being a filled with apartments and fish.
They've been throwing senseless money at Odaiba to make it a commercial hub since the 90s yet its no more than a leisure spot which is not bad, but expecting a periferral location to become a commercial hub is wishful at best and wreckless at worst.
Unfortunately globalization has ensured that de-centralization will never hapan. The need for companies to be in close proximity to one another to get the best out of agglomeration meant that companies kept flocking to Tokyo.as for depopulation.. I, and many people outside of Tokyo, much prefer Japan de-centralize so other regions can regain its population and industries. Tokyo is growing at the cost of most of the other prefectures.
And even within Tokyo, the highest number of jobs is still contained in the area surrounded by Marunouchi, Nihombashi, Yurakucho and Ginza nevermind the efforts made to decentralized that area by moving the government offices to Shinjuku. The Kanto region transport network is concentrated there and changing this is impossible.
One can even make the argument that centering the Shinkansen network around Tokyo station accelerated the mass exodus to Tokyo and the resulting de-population of other regions. The Shinkansen was thought of as a way to rejuvenate the economies of other regions outside Tokyo, instead it accelerated their decline and further reinforced Tokyo's centrality.
The industries that once thrived in other regions have long been exported to China and are never coming back. Leaving the financial and administrative components to cluster around Tokyo.