Love it Joe!! If I had a spare million (any backers?), I'd develop a portable 250m velodrome company to move round the less fortunate areas of the country....there are enough empty superwarehouses in the UK lying empty, and this way they'd be in use!
Back on topic, turbos and rollers serve different purposes:
Rollers are useful for developing balance and a smooth pedalling action. Most don't have any resistance. Ideal to warm up on at the velodrome and road races.
Turbos are useful for longer structured training sessions. The resistance can be changed to simulate hills and drags, focusing more on power, heart rate and intensity. Useful for warming up at time trials.
I have both and use both. If I were to choose just one for those cold and rainy days in winter it would be a turbo....I can't last more than about 30 minutes on rollers without needing to take a break to relieve the saddle area!