Well your point is valid if there is the possibility to generate more money in a short period of time or if there is alot of money that isn't being sold for less. (meaning the traders are holding on to their money) Which from my point of view (a goldfarmer) is not the case since the gold traders PM me daily asking for more stock.
In the end it will all be based around the price Jagex will be charging for bonds on 07, we should consider that the rates we maintain for rs3/07 are possibly not the same as Jagex thinks they are.
This last point can greatly influence either price rise or drop of 07gp in the long run.
Finally some economics in this technician filled world of botting