That might partly be due to the price differential between peak and off-peak fares.
It is EVERYTHING to do with the price differential, there's no partly about it. Some countries charge the same price, regardless of time of day, and that would result in complete carnage during peak times, so I take no issue with having a difference, but not one where you pay 3x as much.
In fact, I'd even accept this price differential, if it was only applied to walk up fares, and you get get a "reasonably" priced ticket - say £40 one way on all but the very busiest services (of which there are perhaps 2-3 on the morning W Mids peak), by booking online a little ahead of departure.
No-one has ever explained to me why Virgin have this policy, but I can only assume it is a relic of the franchise process, whereby other operators charge a similar amount per mile (eg First to Bristol TM are even more), but that there is huge peak overcapacity because of this tiny (for an intercity service) headway, and there is only a finite number of people who will pay the very top whack.
Pricing people off the trains evidently works, but it shifts the burden of carrying all those passengers onto the roads. Sooner or later the route needs to be expanded in order to cope with the demand.
Except that the demand clearly isn't there when it counts. If the DfT had teeth, instead of going on their "ABB" vendetta, they should have required more flexibility in pricing as part of the franchise deal - First were going to partially address this by reducing peak fares by ~15% and using more yield management.
The real irony for me is that YM is a concept which evolved in the low cost airlines, of which Branson runs a couple, but they don't apply the same concept to their trains.
Let's see a true picture of how much demand there really is on this line, and then come back and start talking about adding capacity.
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So, if this did go ahead, why build a tunnel under East Midlands Airport?!
I'm with Edwin M on this. It is easy to point to the proposed route map, look at a tunnel and say "how completely daft", but his logic is right - although you should be able to re-position a bus station fairly easily.
EMA handles around 4m pax pa, compared to 9 at BHX, but the numbers alone only tell part of the picture. Most people using EMA are leisure passengers, more likely to travel in a family car, and even if they did want to take a train to the airport, they'd be less willing to pay any premium fares to get there.
Also, the M42 site is adjacent to the NEC complex, so a station there makes sense.
If growth continues at the same approximate 5% annual average since 2004, based on 2011 statistics, the approximate figures for passenger journeys per year will be: -
2050 - 9.63bn
I would caution against using exponential growth figures
ad infinitum - you get the exact opposite of the "5 computers" myth discussed earlier.
You have to ask where this growth is coming from, and for how long it can continue. It looks like we've reached "peak car" a couple of years back, and this is unlikely to reverse even in a growing economy. The argument is that rail has continued to grow, even in the current climate - so essentially, the growth is coming from modal share take, something which, by definition cannot be infinite.
Even with a rising population and an economy returning to growth, it is unlikely that the overall transport pie will grow at anything like the same rate it has historically. If the pie stays the same, your projections take rail to 40% modal share, and if it grows 1% pa, your share is still as large as 27%, on a par with Japan now.