Given that during the .com era investors were willing to fund business models like ordering heavy low-value petfood over the Internet, a CTL plant might not be too much of a stretch as the oil/commodities sector prices get more bubbly.
The time to payoff is vastly greater than it was for the Internet companies.  At least 5 years to build a plant, and nearly 10 from start to full production, including site acquisition, environmental approvals etc.

These projects will either be done by very large energy/mining companies, who can spread the risk over many projects

and/or

with the help of government loan guarantees.