I think the miners who are willing to take lots of transactions and risk the block being orphaned are making some marketing campaign: In order to attract new users, bitcoin must provide some real tangible benefit, low transaction fee is a clearly visible benefit, and when more people are attracted, bitcoin price will rise, then the value of miners' coins will increase by more than 10%, enough to offset the loss from orphaned blocks
Although that does make perfect sense it doesn't take into account the fact that those miners behind the GCF could simply end up not being able to take advantage of adding in more txs to a block due to the network propagation issues.
A likely result is either more SPV mining (which we know is already occurring and is not good for the network as it can and has lead to forks) or even worse blocks without txs (other than the coinbase).
If the latter was to happen then any advantage of having bigger blocks may simply be countered by the single tx blocks but of course at this stage we don't really know what is even likely to occur.
As far as the constant calls to "make Bitcoin more popular" I think there are bigger issues than the confirmation times (user-friendliness of wallets being a major one).