This brings up a very good angle to this thread, actually: did all STAR TREK need was just to get away from cerebralism to get on track - regardless of whose capable hands it was in, practically? I suspect the answer is a resounding "yes," to be perfectly honest. And you know ...Yep. Indeed, it would have been interesting to see how he - Kasdan - and Meyer would have worked off of one another. And, to see what the final product would have been.
I'm sure affording Steven Speilberg would've been half the budget of STAR TREK II, right there, but just imagine what he could've done with it? He was at the zenith of his powers in the 80's (long before he went all Leftist Hollywood "guns are icky and can never be used to effect" conversion. Hell, can you imagine him having an innocent kid get eaten by a wild animal in one of his 90's movies?) And Nicholas Meyer, where the hell did he come from?
He knew somebody, that's all. And his association with STAR TREK was a profitable one, but not a blockbuster one. And that ... THAT ... is never discussed. Robert Wise was a big name director, for example, and TMP was the last time STAR TREK bothered with one, in the movies, until 2009. The franchise could've done so much better with someone like Lawrence Kasdan on their team. Movies that would've been blockbusters at the time and cherished, today ... like GOONIES is, or something like that.