@bloater
Personally (unless you are desperate), I’d wait until the X-T6 is released. Traditionally the out going model takes an initial hit (due to oversupply in the pre-loved market) and then prices start to firm up again.
Also if the X-T6 is released at a price say £200 more than the current X-T5 RRP then instantly all pre-loved X-T5s will get a corresponding price increase. Conversely there is a risk that the new camera has a lower RRP but in the current climate where chips (esp. memory) are rapidly increasing in cost this is extremely unlikely.
IMO you have nothing to lose while waiting other than having a ‘fat’ camera (one could say that it’s bloated!!!)