Unlikely, but not impossible. A situation that has a small chance of occuring has a chance nonetheless. Such things explore what happened if it got that chance.
And besides, do you really think moviegoers and Trekkies are going to give a flying fuck about butterflys in a ST movie?
Of course not. I for one loved the movie.
That isn't what's important here...
I'm only trying to explain the validity of the butterfly effect as a measure of the quality of a TL.
Let me explain in steps to make it easier for myself
:
Let us start by assuming that the butterfly-lite TL is the one which is less likely to occur. This doesn't mean it is impossible, just unlikely. However, it being unlikely probably means its projected parts are less complex. This means the reader will see less originality, less creativity in it, and will thus not appreciate it as much.
Now, the butterfly-rich TL is the one that is more likely to occur, and the more likely its projections are, I would predict that the more 'butterflies' it takes into account. Its being likely means it is more complex, taking into account more factors, and requiring a greater degree of creativity and inventiveness from the author. The reader will see this, and appreciate it more. It makes him think and stimulates him.
Thus, a butterfly-rich TL is, by basic human standards, of a higher quality than a butterly-lite TL.
There are cases where butterfly-lite TLs are fine. In the case of Star Trek, this is because the action takes place in the far future, which we can't predict anyway. What are the differences between two future TLs to us? Furthermore we don't watch it for the perfect projection of AH events - we watch it for the action, adventure, thrills, etc.
Listen, I have a question :
How important is the scope of the POD ? Can it control the amount of "butterflying" in a TL ?
For instance...
POD N. 1 : A more progressive and democratic political party in the Hungarian part of Austria-Hungary wins the elections in the 1890s. Hungarianization from OTL is pretty much butterflied away and the Slavic nationalities of the Hungarian part of the monarchy are taken more seriously and equally than in OTL. The aforementioned part also becomes more industrialised and economically stronger than in OTL.
Question : This is all nice and dandy... But does it effect wider European history (including the possibility of a future WWI equivalent) in any way ? Besides the politically-minor nationalities being respected better and the respective halfs of the monarchy being somewhat more equal... I don't see too many world-shattering butterflies in there... What's your opinion ?
POD N. 2 : Woodrow Wilson is assasinated just before the start of the Versailles treaty conference.
Question : Whooo, boy... What will post-WWI Europe look like after an event like this ? Pretty damn big king-sized butterflies, I suppose... The whole 20. century could possibly turn out completely differently than in OTL. What do you think ?
I don't think the scope of a POD changes the amount of butterflies. It's just that a 'bigger' POD is harder to project forward and get a plausible timeline. Both of the examples you cite would cause great upheavals in terms of butterflies.