My pal over at the Gluten Freeway sent an interesting article about the demise of the Boston gay bar scene. While the internet and online social networking has been described as a contributing factor, the acceptance of gay marriage is also thought to be nurturing mixed-orientation socializing at the expense of gay bars.
This raises the issues of "visibility at what cost?" Enclaves, whether religious, ethnic, or sexual, are created when a group of people is "othered" or differentiated on the basis of a specific characteristic. This is why I believe that Judaism is alive today--because of the vicious and even more subtle forms of Antisemitism that have followed Jewish people throughout history. Tolerance and assimilation would not have forced into preservation a strong identity and rich cultural heritage the way fierce hatred excluded and thereby cultivated a growing and strengthening sense of Jewry over time.
I think it's far too utopian to suggest that the acceptance of diverse sexuality will lead to the magical disappearance of gay bars. Exhibit A: Prop 8. However, I think communities will face changes differently at different times. And while many people choose to assimilate, others still choose to self-segregate--and some prefer a hybrid of the two.