This is really a question for marketers, not economists. Marketers set the price of products, and they set that price based on their estimation of what the market will bear.
I guess what I mean is, will the dynamic of the fanbase change? Will the people to whom the merchandise is marketed continue to be perceived as "devoted" or will it now be geared towards the general public?
Trek has always been marketed to the general public. A niche product is more like
Farscape or
nuBSG. The reason Berman got the boot is because he failed to hang onto the general public audience - the owners of
Trek don't want it to be a paltry niche product.
The real audience for
Trek DVDs is the Wal-Mart shopper. To them,
Trek is just another action franchise, they might look at the racks and think "do I want
Trek or do I want a Vin Diesel movie, hmm..." but as long as it gives them what they want, who cares? Not Paramount. The mass market's money is just as green as Trekkies', and there's a whole lot more of it.
If it appears that long time "devoted fans" are unhappy and sales begin to dwindle, perhaps.
The enormous purchasing potential of the Wal-Mart shopper makes the "devoted fans" just a drop in the ocean. They could all bail on the movie, but if the mass market likes it, nobody will notice.