My first choice is BIP101, but if certain corners of the community are absolutely hellbent on torpedoing it through increasingly fraudulent means (the 'notXT' spoof client, impersonating satoshi, reddit and forum censorship, calling it an altcoin, general FUD or misinformation and all the other underhand and dishonest shit that's currently going on), I would settle on
this proposal as a compromise or fallback.
As far as I know, the BIP 101 is not sustainable (doubling every two years). This is just a conclusion based upon information that I've found through the months (not research). I'm pretty sure that developing lands and especially China can't handle the doubling. The problem isn't really the storage, but rather network bandwidth (i.e. increased orphan rates).
Wouldn't BIP 100 be better, having a soft limit between 1MB to a maximum of 32 MB?
However, we'll see if those currently engaged in said fraudulent activity are prepared to make any compromises themselves.
Fraudulent activity?