Android is a big enough name in its own right these days. There might be a potential but I'd say its small.
Other replies noted that its not in the same market but I'd disagree there -- the whole idea of forcing desktop users to deal with Metro is to push them towards Windows phones/tablets. MS may have underestimated (a lot) the negative reaction to Metro but their original purpose -- getting people to use Windows mobile versions -- is still at the forefront of their thoughts. And rightly so given the current market conditions (PC sales dropping, mobile sales skyrocketing.)
The only players who are likely to lose out significantly from this move is the fringe desktop OSes. Possibly including OSX though Apple's sales tend to be based as much on fanboyism as product quality and certainly not based on price competitiveness so they'll probably just keep on trucking as ever as well.
iOS might be in some trouble though if the tactic of desktop Metro -> mobile Metro ends up eventually working out. They're already struggling mightily against the power of Android and if MS starts making some ground in the mobile market, chances are Apple's going to take the brunt of it. There's still a big "if" regarding the tactic working though of course. MS kind of shot themselves in the foot on that one and its going to take a fairly large effort to recover before they can get back into the race.
All in all though, I expect Windows 9 to be where Microsoft really pulls all the punches. Win8 has been as big if not a bigger disaster than Vista but at the same time, Vista provided a very critical stepping stone between XP and 7 -- not so much on the consumer end but on the developer end. It gave devs a few years of dealing with UAC issues, graphics driver issues, etc on an OS that nobody really cared about before the Win7 big guns came into the spotlight.
Its entirely possible that Win8's Metro will lead to a similar overall slow revolution in time for Win9. Of course its a much more difficult battle -- its right in the face of consumers whereas UAC was mostly behind the scenes and has been pointed out many many times, Metro is optimized for touch -- not for mice. I don't think anyone's yet come up with a UI paradigm that makes Metro apps useful on the big screen but hey.. they've got a couple more years of working on it before its a real problem (or possibly before its a non-issue if the PC->mobile trend keeps on going strong.)