There's still Fuji and Rollei/Agfa slide films, plus you can process B&W negative as reversal film. As long as slide mounts and projectors are available, we can easily project.
Still it is a sad day that Kodak will no longer make E-6. It's a good thing I've already gotten used to Fuji. Now if we could get MP print film easily (not the negative stuff, the stuff they use for prints) it wouldn't be a lot of trouble to shoot negative film and make slides from that.