If you’re going out of your way to have Alley or Curtis reprise the role, yes. But if she’s just going to stand there in silence in the background, they could have just cast some other actor and said it was Saavik. Or better yet, just don’t make her Saavik, which was what they thankfully chose to do.
Robin Curtis played a Romulan masquerading as a Vulcan in
TNG S7 Gambit I & II anyway.
If they had her reprise Saavik iwith a background cameo in
TNG S5 Cause And Effect, it wouldn't have been that big of a deal.
Hell some fans still argue whether
ST:TMP takes place 10 years after the last episode of
TOS or 2 years after the last episode of
TAS (which would be 4 to 5 years after the last episode of
TOS.) <--- My point being there isn't 100% agreement in fandom regarding aspects of the TIS feature film timeline even though in
STII: TWoK, Kirk has the line:
"There's a man...(he's referring to Khan)...I haven't seen in 15 years who's trying to kill me..."
And if one places
TOS S1 Space Seed in 2267 (aired in 1967), that places
TWoK in 2282, and that's where the argument for some about
ST:TMP comes in because some think the 1701 did a full 5 year mission after the V'Ger incident and some don't.
But my overall point: The feature film timeline isn't 100% agreed on by ST fandom anyway.
(BTW -
STVI:TUC was released in Theatres the same week that
TNG S5 Unification II aired in first run syndication. It's why Leonard Nimoy agreed to do one full episode of TNG * yes he's in the last 5 seconds of
Unification I too* as he had a line that references the film, and he saw it as a good way to promote the film to TNG fans.)