As the premise 4 is valid (being the direct deduction of the first three premises), the premise five (5) must be valid too.
Premise five --- the Chinese character system can be mastered in 90 days for anyone who knows not a single Chinese character at the beginning.
Furthermore, the premise five can actually be tested, and such a test was done with the case study data reviewed by,
1. Many American Universities --- data available at http://www.chineseetymology.com/letters.php
2. Taiwan Government --- data available at http://www.chineseetymology.com/taiwan.php
In addition to your own review on those data and this new etymology, you can get some opinions from the academic community about them. I am listing some major Chinese studies institutes in America for your convenience.
1. Center for Chinese Studies
Suite 4668 SSWB
University of Michigan
1080 South University
Ann Arbor, MI 48109-1106
Faculty can be reached at http://www.ii.umich.edu/ccs/aboutus/people/faculty
2. Center for Chinese Studies
UCLA
11381 Bunche Hall
Los Angeles, CA 90095-1487
Faculty can be reached at http://www.international.ucla.edu/china/people/
3. Chinese Studies Program
UCSD
9500 Gilman Drive, MC 0104
Humanities & Social Sciences Bldg., Room 3084
La Jolla, CA 92093-0104
Faculty can be reached at http://chinesestudies.ucsd.edu/people/
4. China Studies
Johns Hopkins University
1740 Massachusetts Ave., N.W.
Washington, D.C. 20036
Faculty can be reached at http://www.sais-jhu.edu/faculty/directory/index.htm
5. Center for Chinese Studies
University of California, Berkeley
2223 Fulton Street #2328,
Berkeley, CA 94720-2328
Faculty can be reached at http://ieas.berkeley.edu/ccs/faculty.html
6. Institute for Chinese Studies (ICS)
Ohio State University
314 Oxley Hall
1712 Neil Avenue
Columbus, OH 43210-1219
Faculty can be reached at http://ics.osu.edu/ics_faculty.html
7. The China Studies Program
University of Washington
Box 353650
Seattle, WA 98195
Faculty can be reached at http://jsis.washington.edu/faculty/
8. American Association for Chinese Studies
The City College-CUNY
Convent Avenue and 138th Street
New York, NY 10031
U.S.A.
Faculty can be reached at http://134.74.90.3/aacs/journal1.htm
9. CENTER FOR EAST ASIAN STUDIES
STANFORD UNIVERSITY
615 Crothers Way, 100 Encina Commons,
Stanford, CA 94305
Faculty can be reached at http://ceas.stanford.edu/people/by_department.php
10. East Asian Studies
Harvard University
1730 Cambridge Street
First floor, S105
Cambridge, MA 02138
Faculty can be reached at http://rsea.fas.harvard.edu/icb/icb.do? ... page394484