The drivechain development arc is exactly how development on btc should go wrt invasive features: it's been thoroughly discussed, elaborated, and built out over the course of years. Right now is probably not the right time for it, as there is still so much progress that can unfold with the current btc tech. But one day perhaps there will be an urgent unmet need, and when that day comes, a well-developed idea will have been percolating for a long time, and can be picked up again, and discussed in the more relevant context of the moment.

Contrast with the approach of trying to cancel discussions on important topics (e.g., what if the dwindling block reward can't support a reasonable level of security in the medium term future? What if evaporation of hashrate produces a death spiral?) as thought-crime, so that when the challenge presents itself, solutions and their implications have barely been talked about, explored, or refined.