I believe there was a thread where someone proved with a screenshot from QR that if you were originally booked on to qsuites but the equipment was subsequently swapped out then QR will re-book you for free onto another qsuite flight.

I cant recall if it had to be the same day or not for departure.

And if they’re not flying qsuites on your route for 2 weeks solid then chances are a change wouldn’t matter for you.