Sentence:  Besides the open question of the full <WSD>introspectability</WSD> of arbitrary application code, there is another mental obstacle: conventional programmers consider that dynamic symbolic models are mere gadget applications, “too slow and not professional" but this situation could change with the maturity of web-based scripting (like wikis, active technology, ...). 
Meaning of the word marked with <WSD> tags:  The quality of supporting type introspection.