Why 'Barbenheimer' might not be enough to fuel a movie-stock rally

• The debuts of "Barbie" and "Oppenheimer" have been hotly anticipated, but don't count on a bump for movie stocks.
• JPMorgan strategists anticipate that the Hollywood actor and writer strike will keep any stock rally muted. 
• The labor walkout creates uncertainty in the film industry even during one of its biggest weekends of the year.

"Barbenheimer" is at the top of the pop culture agenda right now, but Hollywood labor disputes and uncertainty in the industry will likely cap any upside for investors holding onto movie stocks.