To what? Instant runoff, Aussie style?
There needs to be a pre-primary convention held to settle on 3 or so candidates and get rid of the nuisance ones, then hold the primary (closed) and (if necessary) run-off. I’m not keen on instant runoffs, because if we had had that in TX for the Cruz-Dewhurst showdown, an instant one would’ve had Cruz lose. The runoff gave him time for a come-from-behind victory.
I also don’t particularly care for an all-party primary as such. If it ends up with 2 Republicans, it almost inevitably favors the RINO. I’d rather the Democrats be allowed to run their own (ditto for having a Republican in a district with 2 Dems in a runoff).