well you want to turn the debate into "gigabyte by 2024" much like your forum wife mentor used to be part of the 2016 script of anything but core design is "gigabytes by midnight"

there are many many many ways to increase transaction count
a. lean transactions where transactions dont take up full 4mb
b. not have the cludge of 1mb base 3mb witness. and just have full open access 4mb for transactions to fully utilise
c. charge (younconfirm) spammers and non signing proof witness junk multiples.. to deter such spam

and thats without even going beyond you fear of 4mb
as for going beyond. . its not about huge leaps to 1gb in hours/months.. its progressive increases.
these increases dont even need to be instigated by dev politics of threats and blackmail. but using the blockdata to determine that things are getting congested over a reasonable period

EG if 95% of blocks are >95% full and sat/byte >xxsat =peak demand over 13,104 - 26,208blocks (3-6 months)
that way its data driven not HUMAN "god" politics driven