I disagree with the premise of the question.
The IT business adds players as new disruptor emerge, however, no one becomes the single dominant force.
In this sense, the question is malformed, but so are answers to it.
IT is a commodity market, and so it doesn't play well with monopolies - even the Microsoft monopoly was never nearly as total as say, Ma Bell was.
A simplified timeline of disruption:
IBM - System/360, first business computer
Intel - first commercial, mass produced ICs
Apple - first personal computers, then first GUI
Microsoft - first integrated, standardized, and affordable operating system for pcs, then first integrated PC business applications
Google - first integrated, standardized, and affordable (free!) internet user interface, then web-centric applications
All of these companies are still around, earning combined revenues in the hundreds of billions, and continue to innovate and enable innovation: IT since the 70s has been built by startups whose exit strategy is to be swallowed up by the major players.
As much as fanboys and fangirls of each of these companies hate to admit, and as much as their critics decry them, not one of them will emerge as total dominators.
Another market has a similar makeup, that of broadcast: ABC, CBS, NBC, and FOX are dominant players with different levels of dominance in the different spaces, but not one of them can become top dog for more than a few years.
The whole idea that a "final" winner is possible is ludicrous, and patently so.

I think it really depends on what segment of the "IT Industry" you're talking about. In the search, SaaS, and advertising segments I think Google is in a space that would be extremely hard to overtake as a new company. However, when you talk about segments like chips I think a case could be made for both Intel and AMD, in the business intelligence software industry I think Oracle will win. So, like I said it depends on what in particular you're asking about. In the online debating and decision making segment, I think CreateDebate has a great opportunity to emerge as the market leader.

I think that Google is the most likely to be the final winner in IT industry because the digital convergence is getting closer and network effect is getting bigger.