Why are some Nintendo fans so opposed to going third party?

[Captain_Tom]

Purple said:

Soundwave said:

An alliance with Google or Microsoft would give them a much larger audience on their own terms. 

If done correctly a Google-Nintendo phone could outsell all the consoles combined from this coming gen for example. 

This would be absolutely amazing. I wonder if there would be a big market for it?

Seriously imagine a new pokemon and mario on android.  It would sell INSAnELY well even at $20!   Think how much money Nintendo could be making...