That's not to say these adaptations will be good, but they're certainly filmable. Neuromancer gets a lot of cachet, but other IPs have been attempted already. Villeneuve successfully made a good Blade Runner sequel. Live-action Ghost in the Shell happened- it was execrable and wrapped up in controversy, but it still got made and the neon-soaked setting looked decent. They made a fourth Matrix. Stepping away from cyberpunk, Childhood's End got a miniseries. The Expanse got a full show.
So I doubt that there's anything inherently more difficult about Gibson's novels. If anything, the popularity of Cyberpunk 2077 and its Edgerunners anime has primed the public for '80s retrofuturistic cyberpunk, so they can choose to adapt this as a period piece if they wanted to, without "modernizing" its futuristic conceits. No need to add smartphones.
Call me when they start adapting John Brunner '60s new wave sci-fi. Now that would be a hard sell.