Stinger RMP is a fairly big update and there was some talk a while back of Australian Special forces gaining their own portable air defence capability, so this may or may not have legs...There's a certain question of, with what...
RBS-70, well, we've already got it. Big update circa 2011 (not sure if launcher only or also missile upgrades), still seems to be selling well. Question of the additional training costs of laser-beam riding vs passive IR guidance. Also, problem of rather bulky launch system.
Stinger doesn't seem to have been seriously updated in the last decade and a half. That said, could probably relative cheap compared to RBS-70 and Starstreak due to the yanks having large stocks of 'em.
Mistral. Last big update to the missile seems to be circa 2000ish. What I can find per range on the 'net put it slightly inferior to Stinger, Starstreak and RBS-70.
Starstreak... Well, laser beam-riding like RBS-70, and we could no doubt uhm and ahh all day about the relative merits of it's high-speed tungsten darts vs the RBS-70's lower velocity conventional missile with proxy-fuse. Also in service with relatively few nations (5 vs RBS-70's 20, Stinger's 32 and Mistral's 28), raising issues about long-term support.
So, I actually wouldn't be half surprised if any MANPADS capability is met by keeping RBS-70 round...
The interesting point is the 'man portable' comment, given RBS-70 isn't 'man' portable...