What's most likely to happen is miners will max out the blocks they
mine simply to try and get as many transaction fees as possible like
they are doing right now(there will be a backlog of transactions at
any block size). Having the block size double every year would likely
cause major problems and this proposal allows over a 7x increase it
seems.
The main problem with this proposal I think is that users effectively
have no way to stop the miners from increasing block size
continuously.