Wrong.
The discovery of 2003 UB313 Eris, the 10th planet largest known dwarf planet
by Michael Brown
http://www.gps.caltech.edu/~mbrown/planetlila/
[snip] ...The orbit of the new dwarf planet is even more eccentric than that of Pluto. Pluto moves from 30 to 50 times the sun-earth distance over its 250 year orbit, while the new planet moves from 38 to 97 times the sun-earth distance over its 560 year orbit. [end]
and if planet x is on a concentric orbit that stays way out beyond Pluto, we still won't know why the planets and their moons in the outer solar system are heating up and showing more volcanic activity
and there will be no need for that observatory built down in Antarctica in 1994 to search that part of the sky to watch it and Robert Harrington the (late) former Chief of the Naval Observatory got all excited about nothing and ran down to New Zealand and never came back for nothing
and we are spending $12 billion a year to develop satellite coverage over the poles not to watch for shift and measure magnetism fluctuations and undersea volcanic vents melting the ice caps from below- but will instead watch surface borne manmade carbon melt the ice caps from above
and what is supposed to start showing up in the sky visible to amateur astronomers this summer won't be that planet x
And people won't get all riled up by the fictional movie “2012” due out this summer
And 2012 will pass just as quietly as Y2K
and I will have some survival plans, skills and supplies to save for the next big tin foil hat scare!