People would rather have $5 today than $5 tomorrow. Many people would also prefer $5 today than $8 in 3 years, and some people would also prefer $5 today than a possible $20 in 3 years. Hopefully SIAF/TRW will give us a lot more details about TRWs future, both in the probablity of success of a listing in HK and a timeline (2019-2020), and in terms of profitability now and in the future.
Besides the loan/pre-IPO (i.e ramping up the megafarm) I think there is one way to convince more people to be happy with a "non-tradable" TRW-share for 2-3 years, namely cash dividends. If TRW were to declare a somewhat significant (5-10% yield) quarterly/monthly cash dividend from the ex date until its listing, that should attract more people to these free shares.