Like what general investors in BTC have decided, its not meant to be used to buy groceries. Its a store of value
If developers agreed with that position, they would just stop working on scaling solution, and only fix some minor bugs. But that would make Bitcoin no different (except for amount of hashing power) from any altcoin, since they all have pretty similar structured blockchains and features that come with it. So, even if Bitcoin just an investment for you, you still should support changes that can one day make it a viable currency for masses, because that's what will give it the biggest value out of all cryptocurrencies.
All is see to bitcoin is a brighter future that is obviously open on further development. Bitcoin as a form of crypto-currency is a way or an option for people to have a purpose on transaction. It is more reliable and fast at the same time compare to fiat. And as a part of technology bitcoin is more centralized in the market if people will choose to used it as a form of transaction on a daily basis. But the best part is bitcoin does have development in all aspect that is aligned to the support of the people so if we choose bitcoin and used it we develop it more.