I believe that to completely understand the phenomena, you must go a bit further back than texting. In the 1980's, when personal computers became a "necessity", it began our slow side into impatience and illiteracy (so to speak). Computers require short-hand and, worse, with the advent of the internet and Windows, you have people of all ages who come to expect information and satisfaction instantaneously. Spelling and grammar have never been a school child's favorite subject, but with spell check and other document tools, you lose the point of spelling and grammar knowledge completely. You now have adults, as well as children, who may submit higher level papers or business documents which have been spell and grammar checked - yet, which may also still contain inaccuracies.
Texting is only the continuation of this sad, downward trend, but there will always be some people who resist the general laziness of society and check their own work. How can children know when is appropriate to use or not use text language if their elders do not?