I trust Greg Maxwell far more than Gavin Andresen. Gavin has proven to be nothing more than the token paid dev of Bitcoin big business. The only reason Maxwell has been pushing side chains (if you follow the arguments from the beginning) is because they would allow needed features without bastardizing the original design of Bitcoin. If you're going to change something as fundamental to the original design of Bitcoin as block size why don't you just increase the max coins above 21m or lock the mining reward at 50 coins? The only way to change a basic core design feature of Bitcoin is to admit that the design is flawed. If that's the case then design a new coin that's not flawed, implement all of the corrections you want to the new coin and end this failed experiment. To me this argument is no different than PoW vs PoS. You can't fix that midstream. You need to start over.