Re-title the show and keep it going!
They should make someone else the lead star (a former DW companion, heck, a former Doctor), re-title the show ("Time Team Adventures", "Weird happenings.org", "Monster Finders: The Further SJA"), and keep the show going. Just say that Sarah Jane went off on an adventure, and was last seen getting into the TARDIS with the Doctor. The young cast is too likeable--and the show is too good--for the show to just end like this. I miss Lis and Sarah Jane like everyone, but they should dedicate the show to her and keep it going.
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