Why are Texans so resistant to change in their government?

The current version of the Texas State Constitution was ratified in 1876 when Texas was still predominately a rural state. However, since the 1950s, the state has become more and more urbanized. As of 2010, more than 80 per cent of the state’s population lives in a city. That brings to question as to how contemporary the constitution is.
It was designed for a state dominated by agricultural interests. It contains more that 90,000 words and has been amended nearly 500 times … with most of those changes occurring after 1960 (as compared to the US Constitution with only 7500 words and 27 amendments). This has led to calls for a convention to rewrite the document (1913, 1917, 1949, 1957, 1967, 1973, 1993, and 1997 among others). All have failed.
The most serious effort came in 1974 following the wake of the Sharpstown scandal. The voters of Texas approved a convention to rewrite the state constitution. In January 1974, 181 delegates met in Austin to complete the revision of the document. The delegates failed to adopt their own work. The revised constitution was never brought to the voters.
What happened? what went wrong?
Will it ever be rewritten? under what circumstances?
Why are Texans so resistant to change in their government?