A recent study indicates that, as of 2012, global pension assets in 13 mostly  4  BIS central bankers’ speeches  developed countries total USD 29,754 billion. You can add the other classes of large investors: private trusts, university endowments, and so on. There is significant potential for tapping these sources.
Studies seem to indicate that there is a significant extent of home bias in the investment strategy of the manager of these funds, particularly in regard to bond investment. Thus it may not be sufficient to lubricate our markets in the hope that foreign investors would evince a great deal of interest.