It's already happened: I reduced my μ43 kit and removed nearly all traces of Sony and Pentax kits for the S⁵ and 20-60. My path is set, and my ability to shift is about gone.
It's liberating!
Liberating indeed, I still have Pentax and other film era lenses but they have little value and TBH are optical garbage in comparison to Lumix 24-105 and 70-300. I know Jonathan Mac still likes some of them but I find the colours and rendering belong back in that era.
Exception being the F*300 f4.5 which I still have, I thought about selling it (I couldn't trade it with my digital era Pentax against my S5ii combo) and nobody seems to want this ex-renouned king.
I recently discovered that the focus ring material had lost it's grip on the barrel so that means even less value so... I bought a cheap K-mount lens to scope converter to try and use it as a spotting scope or small telescope.
Weather has been bad but it's sharp without any CA (F*300 has ED optics) on nearby views. The 5x converter is probably uncoated so contrast is diminished but it's a cheap 1500mm scope or 30x. I may get some joy out of it?
As for the others, I may still have a dig at film sometime or try the Vivitar 28mm f2 close focus for flowers due to the unique bokeh.
Some suggest older adapted lenses are good for video, no doubt some are but an S5ii with the modern AF lenses are hard to beat, then you have the LUTS. But if you want pologonal bokeh, the dreamy look etc. these still have application but losing video AF and needing to use manual aperture rings is for me a no no. I don't understand why the aperture ring is making a return.
Sorry I've went off on a tangent, getting back to your scenario I always thought in general the bigger sensor FF images look better than M43/APSC.