If Ronda/Floyd ever happened, both would obviously defend against the others' strength. I doubt Ronda would even bother standing with Floyd in an MMA fight. Literally, would start on the ground like she said in the interview. People say that Ronda has taken some clean punches in her last fights, which is true, but obviously she felt that she could eat those punches because those women were not a threat to KO her. She wouldn't approach Floyd in that manner at all. She'd do everything possible to avoid boxing.
Floyd on the other hand would be in allusive mode in an MMA fight, as to not end up clinched or on the ground. Not sure how it'd be fair to ask him to compete in an MMA fight since he doesn't train in other techniques.
Like I said before, in a street fight for survival, I'd honestly like to see it. I'd also like to see walking around weight comparison picture between Floyd and Ronda. If Ronda isn't much smaller than Floyd, I'd give her a decent chance in a street fight, no weapons.