It would be hilarious to see how they react to... + Facebook and Twitter. + Making a TikTok video. + Someone explaining to them why each of their Spotify checks are $8.34 for the month. + Their original documentary only being shown on a free streaming service (Crackle/Tubi) which only shows two commercials. One for a senior retirement villa and the other for a conservative political candidate who used to "Head Bang" to Damn Yankees and Europe."
Spinal Tap is one of those films that's lasted for decades relatively untouched. A sequel will taint that I think. I have faith in Christopher Guest et al that they'll try, but it's not going to be as funny.