Two of the major challenges displacing PPT with interactive tools, particularly in consulting, market research type of business, where large 100+ slide decks are common, are going to be the (1) need to produce decks on clients' templates and (2) need to email decks.
The direction in which a few emerging CSS/JS based tools (slides, reveal, etc) are going will not solve that problem. D3/WebGL etc. are awesome, of course, for the web. However it's relatively rare when a busy exec will have time to use non PPT based deck.