Kyatric Trust me the nausea is not a reason to not support the Rift, especially for a 2D game. That is almost akin to saying rollercoasters should not be built.
As for the fonts this can be an issue but it is due to the resolution of the Rift's screen. The rift is still in it's development phase... the next release (the consumer version, pegged for release next year) will apparently be using 4K res screens and this won't be an issue at all. As it stands the font issues are generally caused by too small of font and looking from too far a distance. If you can't read a font it is usually a matter of leaning your head forward to get a little closer, but any games designed with the rift in mind won't face that issue, I have played many games which are perfectly readable.
I understand it probably isn't on the top of Scirra's to do list but as a new device with plenty of backing and more than just potential it probably wouldn't be a bad idea for them to put in a little bit of research to see what is possible.
I personally would love to be able to use the software to create Rift compatible games and I know some people might not see the upsides but I think loads of people will... I can say with certainty Construct would gain many thousands of new developers the moment they added the support.