I doubt all those whose preferred candidate has failed will be looking for another remainer candidate. Furthermore, unless supporters abandon Boris he's a shoo in for the last pair vote of all members.
What price for a Tony Blair at this moment? B all.
What price for a Margaret Thatcher at this moment in time? Well in fairness, the only thing she seemed ok at was standing up to the EU, but one would be loathe to offer her a PM job ever again, not having experienced it once. But Nigel Farage is available !