Now that the Warnock campaign is visible in the media and Loeffer support seems really hollow, no chance (even before, it was small).
I do still think Lieberman will get relatively meaningful showings in some places outside of the ATL media market simply due to name recognition issues, but that's not going to be enough to create a R-vs-R situation. Oddly enough, I think Lieberman's range of possibilities is highly clustered; he'll either get less than 5% (which is much more likely) or >10%.
Absolute best-case scenario for Lieberman and/or the GOP would be:
Maybe something like 36% Warnock, 28% Collins, 20% Loeffer, 12% Lieberman in that specific scenario.
Increasingly, I'm thinking it'll be more like 43 Warnock, 34 Collins, 14 Loeffer, 3 Lieberman.