I mean, by that same logic to begin with Asuna would never get NTR-ed away, so yeah XD Just saying that 'Reverse NTR' of the SAO girls would at least be more believable than all of them getting not-NTR-ed at once like some people do
And the thing is, if Asuna really betrayed Kirito like that then they would NOT care anymore for her, as she hurt not only him but their friendship too.
Granted, none of this applies in the slightest to Fujino-sensei's work where said healthy relationships are nonexistent, but it was still an interesting tangent to go off into XP