Pretty unpredictable. Maybe if Kern comes out (if he hasn't already) and campaigns on behalf of vdB then maybe he could get another win.
Kern and most SPÖ-politicians have already endorsed VdB already, appear with him at campaign events and allowed the VdB campaign to use their poster spaces around the country ...
On the other hand, Kern is already thinking beyond the Presidential election to the next federal elections: He debated Strache (FPÖ) yesterday, in what the media described as a "cuddle-debate", because neither man attacked the other and the debate was generally very polite and down to facts. It seems Kern is "preparing" for a possible FPÖ/SPÖ coalition, even though nobody knows how this would work. The SPÖ's Left would probably splinter in this case, or stage massive protests. But the current poisoned SPÖVP governing climate is making even FPÖ/SPÖ not that unlikely: There's a growing wing within the SPÖ that favours a coalition with the FPÖ not just on the state levels, but also the national level. In Vienna, this has led to a crisis meeting in the SPÖ recently and this intra-SPÖ split might also hurt VdB in the Dec. 4 election in Vienna ...
An FPO/SPO coalition wow. How Slovakian would that be? Interesting none the less.