I 100% support the buyback program. This is a short term solution to add value and shows conviction for the long term in the project like you mentioned towards the end of the proposal. In addition, the option to pay gas fee using boba is also a great idea and like you said will take time to implement. That option alone to pay gas fee using boba should bring in some demand and maybe burning mechanism like jun_the_scammer mentioned should be used.
A great and efficient solution for now is to buyback and have a treasury for whatever that is needed to be addressed in the network. Once the ecosystem grows with more dapps from builders Boba will flourish from it.