You're talking about a conditional waypoint, right? eg. reach 2500' or fix YADDA then proceed direct BLAHH. I don't think that has any relation to LNAV and navaid outtages, does it?
No, I'm not - I'm talking about the difference between a fly-OVER waypoint & a fly-BY waypoint, both very much related to LNAV.
A conventional procedure flown using RNAV must treat each fix/waypoint as fly-OVER i.e as it would be using conventional navigation aids.