That's the point. Peak speed is really irrelevant on the northeast corridor. The bottleneck is track conditions and tunnel capacity.
Huh? Of course it doesn't: neither Texas nor California have routes that would be economical for an Acela-like service. LA-SD is a single point-to-point route; neither LA nor SD connect economically with any other California city.
I also don't understand your "peak versus average" speed thing. You're comparing apples-oranges, not me: I'm comparing peak-to-peak. Normal Amtrak trains also don't average 75MPH!
The Acela doesn't run in California and it doesn't run in Texas.
http://texascentral.com/
Trains in Eurpoe are going to 220mph.
http://www.bloomberg.com/video/take-a-look-at-europe-s-faste...
The average speed between NYC and Boston is something like 79mph. Saying you have a top speed 130mph, and doing it only for a small portion of the trip is quite misleading. At any rate, peak has little meaning. I've been on commuter trains that peaked at 90mph for 5 minutes.