Same situation here, I booked a J ticket on seat24 CPH-DOH-BKK (787/380) in Sept., and the connection time has become too short now.

Two questions:
a) Does it even make sense at this point to try to change the ticket, considering that QR might change schedules again until Sept.?
b) In case the departure times stay like this, what would happen if I kept my ticket and just went to the check-in counter in CPH on the day of the flight? Wouldn't they just rebook me on a later flight from DOH?

Thanks for your thoughts/experiences.