A stopgap measure can’t be extrapolated to a full season and a half. The circumstances are different for multiple reasons. Anyone at Sony advocating for that approach shouldn’t be in their job. Nostalgia and sentimentality only goes so far. And roughly 22 months is far too much.
But it wouldn't be for a season and a half. The current season #37 is already set to air through the complete season with Trebek hosting. Next production schedule should start in about three months. It's already common to have best-of episodes inter-dispersed through a regular season anyway. They would just be stretching that run a little longer, especially during the upcoming Holidays.
Assuming they understandably push that production date out, they could run a mixture of best-of's and first-runs through Winter. That would give them at enough time to select a replacement host and start ramping up production in time for Up Front's and release next Fall.