Shorting a remote control push button with GPIO and a transistor potential conflict?
There will be no conflict between the transistor and the button, but the whole circuit won't work in first place. To get it work as pictured, the GPIO signal must have 9-something volt level, which you don't have.

But you can do try this instead:


ADDITION: There will be no conflict because there is nothing to conflict with - both components (a transistor and a switch) are both switches connected in parallel, so it is one OR another. Zero voltage across emitter-collector doesn't hurt, and even in the original (incorrect) schematics the base-emitter junction will be reverse powered, and won't conduct anything into RPi (as long as reverse e-b voltage doesn't break the transistor).