Some data that runs contrary to your statements
http://dspace.mit.edu/bitstream/hand...pdf?sequence=1
Table 1: Ranges of Novice, Expert and Predicted typing speeds (in WPM) of various typing systems*
Novice Expert Predicted
Standard QWERTY 24 50-100 150 (typist)
Mini-QWERTY 29-35 58-62 27.7
Multi-tap 2-8 5 21-27
T9 3-10 8-20 45-50
FASTAP 6-8 9 Not calculated
Grafiti/Unistroke 1-10 14 Not calculated
The data shows that miniQWERTY is ten times faster for the experts and 3-15 times faster for the novices as compared to multi-tap: multitap was used in the Leno youtube.
According to wiki on Morse Code:
The fastest speed ever sent by a straight key was achieved in 1942 by Harry Turner W9YZE (d. 1992) who reached 35 WPM in a demonstration at a U.S. Army base. Fastest speeds are a result of "hearing" phrases and sentences rather than words.
mini-QWERTY is fast and accurate for experts and there is no phrase recognition or sentence recognition (or mis-recognition) in the process.
BTW, there are several MC to text message apps popping up on different phones.
mini-QWERTY texters can compete to win $50K to prove how good they are:
How much do the fastest MCers get for their championships?
http://www.lgtexter.com/lgtexter/nationals.html