Whooaahh could not have put it better. There is a lot of misunderstanding about ETP's, one of which will be the Critical Point on the flight. The whole point is to establish, prior to departure, that enough fuel will be available, at any time in the ETOPS portion of the flight, to divert to an alternate, with the specified fuel reserves.
There is no maximum or minimum number of ETP's, they are purely related to the number of alternates selected in the flight planning process.
Of course, the longer the trip and the fewer the alternates selected (thus ETP's) the greater will be the diversion fuel required. If you don't divert, you arrive at destination with more fuel on board than a KC10. Sensible dispatch is the key to safe and economic operations.
