The question is: how important was the QL?
Well if it wasn't for the QL, then Linus Torvolds might not have gone down the path of developing for the QL; and then creating Linux.
So, that's hundreds of millions of Android phones and a pretty decent Linux ecosystem that would probably be in the hands of another company, e.g. Microsoft.
And minix would still be in pretty much the same niche (which is a pity as it's quite nice, but idealism doesn't often correlate with market share).
So, hardly significant at all then really ;-)
But more seriously, being an ex-QL user, I really did enjoy the machine - I even liked typing on the keyboard :-) Even though the architecture was pretty crippled it still felt great to have a 32-bit CPU with a pre-emptive user/supervisor multitasking OS humming beneath my fingertips. I used the computer from 1986 to 1993, the longest time I've had any one computer as my main machine, and then shifted to buying a Macintosh LC II (well, Performa 400).
-cheers from Julz