GSV Capital pursues a similar thesis (top holdings are Palantir and Spotify http://gsvcap.com/top-10-investments/) but looking at their 5-year performance, the public interest has been rather tepid.
Here's a harsh, but interesting, counterargument to why GSVC isn't performing well - https://seekingalpha.com/article/1692862-use-the-twitter-ipo...
I really like the idea of doing share buybacks of this public security, and does offer a different path to liquidity for a company and founder/employee (sell a part of your company for a publicly traded security, which you can sell at market prices for immediate cash)
The instrument is useful for speculative bets, so I guess the supply of it highly depends on the availability of speculative capital.