I guess if you limited on space it might be handy to have one BIG laser that does everything, but the flexx is pretty much the same thing, personally i would rather have 2 separate lasers, that way at least if one breaks you can use the other, plus you can do 2 jobs at once. CO2's are good on pretty much everything Fibers aren't so you would really struggle to find a use for on the fly changes (no doubt someone will but its going to be rare). For fun this year im going to convert a Chinese CO2 to a fiber as i have a spare 20watt fiber source and all optics to create a cheap large format fiber, but i cant even see that getting much use, Galvos much better for fibers in most cases, large format you would probably be better with print or chemical etch !!
Do like the look of the Eurolaser, now that would be a useful tool
L Squared Lasers UK
2 x Halo Lasers 20 watt fiber
1 x Halo CO2 Galvo System
1 x Shenhui 1512 80 watt
3 x Electrox D40
3 x electrox Scriba 2
1 x Electrox Scorpion 40 watt Fibre
1 x Epilog EXT36 75 watt.