MIT is projecting a cost as low as 39 mils/kWh. That compares with current costs of 31 mils for fossil/steam; 13 mils for hydro; 20 mils for nuclear; and 62 mils for gas turbine (FERC Form 1 reports for 2007). Nuclear costs are low because they're from long-amortized plants. Hydro is about crapped out for growth. Gas, coal, and oil prices have nowhere to go but up.
The MIT projection is based on an upfront investment of roughly $1 billion, which will be a sunk cost that, in itself, can recover little of its initial cost. Like many such projects, private companies are not going to engage in much pure or early-stage research without some subsidies, because the expense is large and the benefits will acrue to their competitors, as well.
So your premise is estimated to be wrong by top researchers in the field. The people at MIT generally do their math very well. Since your premise is wrong, your conclusions are wrong, and the rest of your post is moot.