Never, ever, ever, ever. It reminds me of the current RL fashion of destroying race tracks with chicanes to slow the cars down (think Le Mans). It's racing, why the hell do you want to slow the cars down?!
I wouldn't mind seeing a chicane-free Blackwood, but only if it was introduced as one variant among many (several of the ones sketched above look nice). As others have said, BL with no chicane would look historic and would suit certain monster cars like LMPs. I admit it would be boring as hell to drive in anything under 500hp though.
Hmm, i'm in two worlds about no chicane BL. If it was to be removed, add something a bit further down. (as said before about using the bridge, would be rather neat tbh) or maybe make the last few turns just before and after the last sector checkpoint twisty.
It wouldn't add much challenge to the track. And if anything, that chicane adds some overtaking chances on the big turn after.
It COULD be an Historic layout, but then you'd have to add/remove something else too. And the Blackwood enviroment looks pretty tight already... doesn't look too modeable to me. See how's even some buildings near the track?
Well, if you get that OPTION, another driver comes and wants the option to have the uphill chicane @ AS removed, the next one doesnt like the SO Classic chicane etc...