Of the 4 MNO, only Singtel has business outside of SG as a form of geographical diversification. For MVNO, the ones doing well happened to be the 2 that diversified their geographical reach, namely Circles Life and MyRepublic.
Grid Mobile has deep pockets in ST Telemedia, a portfolio subsidiary of Temasek Holding. In effect, Temasek is indirectly enjoying the profits in the expense of Singtel shareholders

. ST Telemedia is also the major shareholder of StarHub, if you get the picture.
StarHub direction seems to be going away from content and into other cloud services under the influence of ST Telemedia. Net asset is like about $400m.
M1 ownership belongs to Keppel Corp and SPH, both trying to diversify their business away from their core businesses. I read somewhere that M1 would be driven to deliver content. But at this market, a better way is to buy into emerging market to drive growth rather than compete solely in SG. Why Keppel Corp and SPH taking the company private is exactly to pump in capital to rebuild the business. It is unlikely for M1 to buy over TPG as it means self competing without real benefits like synergy from different networks when they want to move to 5G. Even if M1 is going to buy over something, it has to generate enough revenue and profits in the long run. Buying into 4G is not quite right for the next 5 years plan. I eventually see M1 pumping more capital to buy into overseas entities. Then they will be burned as they are not natural telco competitors according to their SAF Generals in the senior management.
Will Temasek Holding want to have 100% reach to all telcos in SG? Very unlikely.
It leaves MyRepublic as the only feasible partner to buy over TPG. If TPG is unable to generate any decent revenue in the next 2 years, you can be sure MR will come knocking with capital funding to bail TPG out.