Making bitcoin less defensible and same time central point of failure is certainly nothing that will win over many (possibly merge mined) chains which are more defensible.
Doge and general altcoin growth has already shown: people who come late are likely to go for a new chain (intuitively because nobody buys the one-world-chain-crap because it's not desirable and people intuitively choose the better wealthdistribution that altcoins offer, the 'one chain for alll' is not even technically possible without sacrifice in security and useablity)
Also smaller cap offers higher potential returns. The distribution of value into a decentral multi-chain economy will happen naturally.
Gavin admits it himself: all this discussion just takes place to prevent altcoins from gaining marketshare; it's inevitable though.
So this whole 20MB crap is officially motivated by greed and nothing else.
Best bitcoin can do is care about defensibility to keep the position of the goldstandard. Messing up its defensibility and useability with bloat-blocks will lead to its demise.
I read 'consensus war' ... this translates for me to 'selfdistruction'