I think the X is going to "re" sell to Xbox fans very well, so it should give hardware numbers a decent boost, though it will be interesting to see if it significantly increases software sales or if it mainly just keeps those in the xbox family entrenched in the xbox family. With that hardware boost, especially in this launch period where I think we'll see the xbox faithful go wild for it, I could see the Switch catch it in about four years. Of course, if the ps5 ends up coming in 2019 or so, I expect MS to quickly move on to the Xbox 720 or Xbox One Two or whatever they have planned, so sales would tank then and Switch could catch it sooner.
Still, I'm bullish on the Switch, so I do think it will surpass the xone eventually. The PS4 I'm not as certain. It will obviously beat it handily in Japan, but I don't know if Switch is going to be able to do the European numbers necessary to catch up to Sony's lead. It's already at $299, and so price cuts aren't going to be quite as effective for it as they were for the $399 systems, I think.
