It will be interesting to see how this plays out, but a six month resignation window would give the political parties enough time to select a candidate and conduct an effective campaign in my opinion. Those pushing for a constitutional change to a four year Presidential term are likely trying to save Yoon the humiliation of resigning:
The PPP leadership is under growing pressure to present a unified exit plan as opposition parties have vowed to submit a second impeachment motion as early as Wednesday, with plans to table the motion at a plenary session on Thursday. The lack of a consensus on Yoon’s exit plan within the PPP may threaten a unified front to boycott a second impeachment motion.
PPP lawmakers aligned with Han have advocated for Yoon to step down as early as within six months, a scenario that would trigger a presidential election within 60 days from his removal in accordance with related laws.
However, pro-Yoon lawmakers are calling for a more gradual timeline, with some suggesting a constitutional amendment to shorten the presidential term. This process could delay his resignation until 2026.
The president’s five-year term officially ends in May 2027, but his political career has been cut short following the martial law fiasco on Dec. 3, with growing public calls for impeachment.
You can read more at the link.