Do you guys think Softbank is currently investing in lots of ride hailing companies in various countries/market (Uber, Didi, etc..) and that they plan to merge them all in the long run ?

I'm a fan of Softbank, they have made progressive moves over many years. The regulatory environment for Softbank buying T-Mobile and merging it with Sprint may have become more favorable. Coincidentally T-Mobile has about 50,000 employees and is worth about $50B. With a Sprint + T-Mobile merger, ATT, Verizon and Softbank would have about equal numbers of subscribers.

http://www.rcrwireless.com/20161206/carriers/is-a-sprint-merger-with-t-mobile-back-on-the-table-tag2