TXが東京駅や土浦へ延びたら便利ですが、臨海地下鉄はその土浦へ延ばす負担を代替わりできるでしょう It would be convenient if Tsukuba Express(TX) were extended to Tokyo Station and Tsuchiura, but Waterfront Subway could replace the burden of extending it to Tsuchiura. 私として、5:48のような東京一極集中が止まらない懸念を受け止め、国として茨城県など北関東エリアの活性化を図るべきでしょう Personally, I believe that the country should take measures to revitalize northern Kanto area, such as Ibaraki Prefecture, in recognition of concerns about the unstoppable concentration of people in Tokyo, as seen in 5:48. TXを土浦へ延ばすのはその一環にできますが、地震が少ない群馬県は高く評価すべきでしょう Extending TX to Tsuchiura can be part of this, but Gunma Prefecture, which has few earthquakes, should be highly evaluated. ディズニーが好きな方は、有楽町線が舞浜へ延びたら便利で快適になると思われます For those who like Disney, it would be convenient and comfortable to extend Tokyo Metro Yurakucho Line to Maihama.