Fons if you were contemplating a Fuji camera and lenses as "another system" then that would be expensive, the way I changed was to part exchange my Nikon gear so I never ended up paying the full price when buying!
I don't actually think that Fujinon lenses are particularly cheap but they are good, very good, and the X-T2 is superb!
It does take a leap of faith to make a move, and speaking for myself I wavered for a considerable time before taking the leap, but I think it was worth the jump.