No it wouldn't be fine. Every time there is a shortfall, South Texas gets screwed. Taxes are collected throughout the state, but expeditures are concentrated mostly in and near large cities. Corpus Christi didn't get connected to the Interstate Highway System until 1981 which was a full ten years after the orginal Interstate system was supposed to be finished. Corpus Christi didn't even get four lane divided highways all the way to Houston till 1988. Supposedly the Interstate system was to connect over 95% of the cities with over 50,000 population. Corpus Christi had over 200,000 in 1970 and has almost 300,000 now. A toll road system connecting the whole state together is a lot fairer than the current system that taxes everyone but allocates funding to the biggest cites with the most representation in the legislature.
The problem with that is, if you turn the whole interstate system in Texas into toll roads, Texans will essentially be paying twice for it, once already through taxes, then again through tolls.