There will certainly be a segment of gamers it might interfere with--in the same way that the DS might--that being those who haven't been into portable gaming before now and don't have a habit of picking up anything and everything. If they are indeed going to pick up either system, as well as a reasonable amount of games, then it could affect their budget enough for them to hold off when Xenon rolls around. (Especially as a purchaser has a higher likelihood of leaning in Sony's or Nintendo's direction anyway, and would more likely want to wait for their next systems to launch.)
Will it affect things to any huge degree? Likely not. Certainly not more so than the full info on PS3 and N5 (power/features/etc) would do; if Xenon ends up underneath its competitors this time, they can't lean on the advantages that drew more people to the Xbox this time around.
Otherwise, the portable and mainstream consoles are still split enough to not interfere with each other, except for those who are borderline already. This may change over the course of the next generation (building console/portable interlinking capabilities and making them much more interesting to have in conjunction), but it won't have changed by Xenon's launch.
Will it affect things to any huge degree? Likely not. Certainly not more so than the full info on PS3 and N5 (power/features/etc) would do; if Xenon ends up underneath its competitors this time, they can't lean on the advantages that drew more people to the Xbox this time around.
Otherwise, the portable and mainstream consoles are still split enough to not interfere with each other, except for those who are borderline already. This may change over the course of the next generation (building console/portable interlinking capabilities and making them much more interesting to have in conjunction), but it won't have changed by Xenon's launch.