The other idea is to declare staking period upfront and weight-value your votepower accordingly.
There were various solutions discussed both layer1 and layer2. Like giving up some part of your HIVE for shorter period of power-down. Most of these brought by the fear of the markets, not substantial arguments. This might come back again and again but without essentials discussion is futile.
Actually without this long period the whole value is lost, so if somebody doesn't get it there are other options to invest: liquid HIVE, HBD, HE-tokens.
HP is a governance token and 3months make sure that people involved are ready to take long term commitment to support their ideas and views. This is basic of HIVE. Stake is a warranty for all investors that this place will be lead in the better direction. Hive is the only altcoin without company behind it which would be incentivised by profit to improve itself. Hence 13weeks. Is it a lot in this context? Not IMO.
This ecosystem is thought-through really good and changing such crucial things shouldn't come easy.