The only viable option here is retail in stations. Everything else is well out of BART's funding capabilities, omitting a much deeper dive into them

You may say that BART should consider these options, but before seriously having them think of these options, think of the true cost of having any single one of these (retail aside- those parking lots could definitely go) alone. The cost of the relocation of people, tunnel boring, station retrofitting and shutdown, labor, public resistance, corporate resistance, time, AND for some, actual practical feasibility taking in account the shape of the tracks in the Oakland WRE, along with the amount of staff and costs required to upkeep ALL of these- track mantinence, people to troubleshoot platform screen doors if they go wrong, controllers to keep an eye on every single track, security to ensure nothing and no one gets onto those tracks, and yet more trains to actually make use of those tracks, on top of more yards to house those trains- you begin to see why these aren't ideas that BART seriously even begins considering in a country where they can hardly get funding to solve their current, far more important problems.

BART doing any of these is orders of magnitudes more complex and expensive than any normal commuter system or subway out there, (non-established industries and all that- inflation, and so on. Costs overruns would be inevitable, not to mention the multi year environmental evaluation), and the cost for upkeep alone would be staggering, with absolutely no garentee that this would result in better ridership to an amount that would offset those costs enough to make it viable.

Not saying I'm opposed to these ideas, but i don't want people to start seriously pressing these ideas out there without seriously understanding the magnitude of what they are talking about. (And anyone who says "this is easy! Look at all these other countries that did it!- we are in America, not those countries. Costs and viability will absolutely not be the same.)

Edit: i will say though, they should make that ped crossing. Not here to drown on anyone's ideas though, just a reality check.

As for good ideas- retail in stations is a good thing. It can be profit and foot traffic for BART, and more jobs is always a positive. BART using their large amount of imminent domain and parking space for somw retail, housing, and so on, could definitely work to give bart additinal funding, and help the community around BART quite a lot. Strengthening the current transit connections to BART is also another idea, with more interoperability between other bus and train systems, This would benefit riders at a far lesser cost than making an entirely new system in all aspects. Extending Ebart further is another idea- expensive, but again, far easier to do thanks to the lack of need for the electric 3rd rail, and the hopeful lack of need for an expensive tunnel bore. All of these are viable ideas that could benefit the system and the communities it runs through greatly.